#!/usr/bin/env bash
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# SPDX-License-Identifier: LGPL-2.1-or-later
#
# shellcheck disable=SC2030,SC2031
# ex: ts=8 sw=4 sts=4 et filetype=sh tw=180
# Note: the shellcheck line above disables warning for variables which were
#       modified in a subshell. In our case this behavior is expected, but
#       `shellcheck` can't distinguish this because of poor variable tracking,
#       which results in warning for every instance of such variable used
#       throughout this file.
#       See:
#           * comment in function install_verity_minimal()
#           * koalaman/shellcheck#280
set -o pipefail

PATH=/sbin:/bin:/usr/sbin:/usr/bin
export PATH

os_release=$(test -e /etc/os-release && echo /etc/os-release || echo /usr/lib/os-release)
# shellcheck source=/dev/null
source "$os_release"
[[ "$ID" = "debian" || " $ID_LIKE " = *" debian "* ]] && LOOKS_LIKE_DEBIAN=yes || LOOKS_LIKE_DEBIAN=""
[[ "$ID" = "arch" || " $ID_LIKE " = *" arch "* ]] && LOOKS_LIKE_ARCH=yes || LOOKS_LIKE_ARCH=""
[[ " $ID_LIKE " = *" suse "* ]] && LOOKS_LIKE_SUSE=yes || LOOKS_LIKE_SUSE=""
KERNEL_VER="${KERNEL_VER-$(uname -r)}"
QEMU_TIMEOUT="${QEMU_TIMEOUT:-infinity}"
NSPAWN_TIMEOUT="${NSPAWN_TIMEOUT:-infinity}"
TIMED_OUT=  # will be 1 after run_* if *_TIMEOUT is set and test timed out
[[ "$LOOKS_LIKE_SUSE" ]] && FSTYPE="${FSTYPE:-btrfs}" || FSTYPE="${FSTYPE:-ext4}"
UNIFIED_CGROUP_HIERARCHY="${UNIFIED_CGROUP_HIERARCHY:-default}"
EFI_MOUNT="${EFI_MOUNT:-$(bootctl -x 2>/dev/null || echo /boot)}"
QEMU_MEM="${QEMU_MEM:-512M}"
# Note that defining a different IMAGE_NAME in a test setup script will only result
# in default.img being copied and renamed. It can then be extended by defining
# a test_append_files() function. The $1 parameter will be the root directory.
# To force creating a new image from scratch (eg: to encrypt it), also define
# TEST_FORCE_NEWIMAGE=1 in the test setup script.
IMAGE_NAME=${IMAGE_NAME:-default}
STRIP_BINARIES="${STRIP_BINARIES:-yes}"
TEST_REQUIRE_INSTALL_TESTS="${TEST_REQUIRE_INSTALL_TESTS:-1}"
TEST_PARALLELIZE="${TEST_PARALLELIZE:-0}"
LOOPDEV=

# Simple wrapper to unify boolean checks.
# Note: this function needs to stay near the top of the file, so we can use it
#       in code in the outermost scope.
get_bool() {
    # Make the value lowercase to make the regex matching simpler
    local _bool="${1,,}"

    # Consider empty value as "false"
    if [[ -z "$_bool" || "$_bool" =~ ^(0|no|false)$ ]]; then
        return 1
    elif [[ "$_bool" =~ ^(1|yes|true)$ ]]; then
        return 0
    else
        echo >&2 "Value '$_bool' is not a valid boolean value"
        exit 1
    fi
}

# Decide if we can (and want to) run qemu with KVM acceleration.
# Check if nested KVM is explicitly enabled (TEST_NESTED_KVM). If not,
# check if it's not explicitly disabled (TEST_NO_KVM) and we're not already
# running under KVM. If these conditions are met, enable KVM (and possibly
# nested KVM), otherwise disable it.
if get_bool "${TEST_NESTED_KVM:=}" || (! get_bool "${TEST_NO_KVM:=}" && [[ "$(systemd-detect-virt -v)" != kvm ]]); then
    QEMU_KVM=yes
else
    QEMU_KVM=no
fi

if ! ROOTLIBDIR=$(pkg-config --variable=systemdutildir systemd); then
    echo "WARNING! Cannot determine rootlibdir from pkg-config, assuming /usr/lib/systemd" >&2
    ROOTLIBDIR=/usr/lib/systemd
fi

# The calling test.sh scripts have TEST_BASE_DIR set via their Makefile, but we don't need them to provide it
TEST_BASE_DIR=${TEST_BASE_DIR:-$(realpath "$(dirname "${BASH_SOURCE[0]}")")}
TEST_UNITS_DIR="$(realpath "$TEST_BASE_DIR/units")"
SOURCE_DIR=$(realpath "$TEST_BASE_DIR/..")
TOOLS_DIR="$SOURCE_DIR/tools"
# These variables are used by test scripts
export TEST_BASE_DIR TEST_UNITS_DIR SOURCE_DIR TOOLS_DIR

# note that find-build-dir.sh will return $BUILD_DIR if provided, else it will try to find it
if get_bool "${NO_BUILD:=}"; then
    BUILD_DIR="$SOURCE_DIR"
elif ! BUILD_DIR="$("$TOOLS_DIR"/find-build-dir.sh)"; then
    echo "ERROR: no build found, please set BUILD_DIR or use NO_BUILD" >&2
    exit 1
fi

PATH_TO_INIT="$ROOTLIBDIR/systemd"
SYSTEMD_JOURNALD="${SYSTEMD_JOURNALD:-$(command -v "$BUILD_DIR/systemd-journald" || command -v "$ROOTLIBDIR/systemd-journald")}"
SYSTEMD_JOURNAL_REMOTE="${SYSTEMD_JOURNAL_REMOTE:-$(command -v "$BUILD_DIR/systemd-journal-remote" || command -v "$ROOTLIBDIR/systemd-journal-remote" || echo "")}"
SYSTEMD="${SYSTEMD:-$(command -v "$BUILD_DIR/systemd" || command -v "$ROOTLIBDIR/systemd")}"
SYSTEMD_NSPAWN="${SYSTEMD_NSPAWN:-$(command -v "$BUILD_DIR/systemd-nspawn" || command -v systemd-nspawn)}"
JOURNALCTL="${JOURNALCTL:-$(command -v "$BUILD_DIR/journalctl" || command -v journalctl)}"

TESTFILE="${BASH_SOURCE[1]}"
if [ -z "$TESTFILE" ]; then
    echo "ERROR: test-functions must be sourced from one of the TEST-*/test.sh scripts" >&2
    exit 1
fi
TESTNAME="$(basename "$(dirname "$(realpath "$TESTFILE")")")"
STATEDIR="$BUILD_DIR/test/$TESTNAME"
STATEFILE="$STATEDIR/.testdir"
IMAGESTATEDIR="$STATEDIR/.."
TESTLOG="$STATEDIR/test.log"

if ! [[ "$TESTNAME" =~ ^TEST\-([0-9]+)\-.+$ ]]; then
    echo "ERROR: Test name '$TESTNAME' is not in the expected format: TEST-[0-9]+-*" >&2
    exit 1
fi
TESTID="${BASH_REMATCH[1]:?}"

if [[ ! -f "$TEST_UNITS_DIR/testsuite-$TESTID.service" ]]; then
    echo "ERROR: Test '$TESTNAME' is missing its service file '$TEST_UNITS_DIR/testsuite-$TESTID.service" >&2
    exit 1
fi

BASICTOOLS=(
    awk
    base64
    basename
    bash
    capsh
    cat
    chmod
    chown
    cmp
    cryptsetup
    cut
    date
    dd
    diff
    dirname
    dmsetup
    echo
    env
    false
    flock
    getconf
    getent
    getfacl
    grep
    gunzip
    gzip
    head
    ionice
    ip
    ldd
    ln
    loadkeys
    login
    losetup
    lz4cat
    mkfifo
    mktemp
    modprobe
    mount
    mountpoint
    mv
    nc
    nproc
    readlink
    rev
    rm
    rmdir
    sed
    seq
    setfattr
    setfont
    setsid
    sfdisk
    sh
    sleep
    stat
    su
    sulogin
    sysctl
    tail
    tar
    tee
    test
    timeout
    touch
    tr
    true
    truncate
    umount
    uname
    unshare
    wc
    xargs
    xzcat
)

DEBUGTOOLS=(
    cp
    df
    dhclient
    dmesg
    du
    find
    free
    grep
    hostname
    id
    less
    ln
    ls
    mkdir
    ping
    ps
    route
    sort
    strace
    stty
    tty
    vi
)

is_built_with_asan() {
    if ! type -P objdump >/dev/null; then
        ddebug "Failed to find objdump. Assuming systemd hasn't been built with ASAN."
        return 1
    fi

    # Borrowed from https://github.com/google/oss-fuzz/blob/cd9acd02f9d3f6e80011cc1e9549be526ce5f270/infra/base-images/base-runner/bad_build_check#L182
    local _asan_calls
    _asan_calls="$(objdump -dC "$SYSTEMD_JOURNALD" | grep -E "(callq?|brasl?|bl)\s.+__asan" -c)"
    if ((_asan_calls < 1000)); then
        return 1
    else
        return 0
    fi
}

is_built_with_coverage() {
    if get_bool "${NO_BUILD:=}" || ! command -v meson >/dev/null; then
        return 1
    fi

    meson configure "${BUILD_DIR:?}" | grep 'b_coverage' | awk '{ print $2 }' | grep -q 'true'
}

IS_BUILT_WITH_ASAN=$(is_built_with_asan && echo yes || echo no)
IS_BUILT_WITH_COVERAGE=$(is_built_with_coverage && echo yes || echo no)

if get_bool "$IS_BUILT_WITH_ASAN"; then
    STRIP_BINARIES=no
    SKIP_INITRD="${SKIP_INITRD:-yes}"
    PATH_TO_INIT=$ROOTLIBDIR/systemd-under-asan
    QEMU_MEM="2048M"
    QEMU_SMP="${QEMU_SMP:-4}"

    # We need to correctly distinguish between gcc's and clang's ASan DSOs.
    if ASAN_RT_NAME="$(awk '/libasan.so/ {x=$1; exit} END {print x; exit x==""}' < <(ldd "$SYSTEMD"))"; then
        ASAN_COMPILER=gcc
        ASAN_RT_PATH="$(readlink -f "$(${CC:-gcc} --print-file-name "$ASAN_RT_NAME")")"
    elif ASAN_RT_NAME="$(awk '/libclang_rt.asan/ {x=$1; exit} END {print x; exit x==""}' < <(ldd "$SYSTEMD"))"; then
        ASAN_COMPILER=clang
        ASAN_RT_PATH="$(readlink -f "$(${CC:-clang} --print-file-name "$ASAN_RT_NAME")")"

        # As clang's ASan DSO is usually in a non-standard path, let's check if
        # the environment is set accordingly. If not, warn the user and exit.
        # We're not setting the LD_LIBRARY_PATH automagically here, because
        # user should encounter (and fix) the same issue when running the unit
        # tests (meson test)
        if ldd "$SYSTEMD" | grep -q "libclang_rt.asan.*not found"; then
            echo >&2 "clang's ASan DSO ($ASAN_RT_NAME) is not present in the runtime library path"
            echo >&2 "Consider setting LD_LIBRARY_PATH=${ASAN_RT_PATH%/*}"
            exit 1
        fi
    else
        echo >&2 "systemd is not linked against the ASan DSO"
        echo >&2 "gcc does this by default, for clang compile with -shared-libasan"
        exit 1
    fi

    echo "Detected ASan RT '$ASAN_RT_NAME' located at '$ASAN_RT_PATH'"
fi

find_qemu_bin() {
    QEMU_BIN="${QEMU_BIN:-""}"
    # SUSE and Red Hat call the binary qemu-kvm. Debian and Gentoo call it kvm.
    if get_bool "$QEMU_KVM"; then
        [[ -n "$QEMU_BIN" ]] || QEMU_BIN="$(command -v kvm qemu-kvm 2>/dev/null | grep '^/' -m1)"
    fi

    [[ -n "$ARCH" ]] || ARCH="$(uname -m)"
    case $ARCH in
    x86_64)
        # QEMU's own build system calls it qemu-system-x86_64
        [[ -n "$QEMU_BIN" ]] || QEMU_BIN="$(command -v qemu-system-x86_64 2>/dev/null | grep '^/' -m1)"
        ;;
    i*86)
        # new i386 version of QEMU
        [[ -n "$QEMU_BIN" ]] || QEMU_BIN="$(command -v qemu-system-i386 2>/dev/null | grep '^/' -m1)"

        # i386 version of QEMU
        [[ -n "$QEMU_BIN" ]] || QEMU_BIN="$(command -v qemu 2>/dev/null | grep '^/' -m1)"
        ;;
    ppc64*)
        [[ -n "$QEMU_BIN" ]] || QEMU_BIN="$(command -v qemu-system-ppc64 2>/dev/null | grep '^/' -m1)"
        ;;
    esac

    if [[ ! -e "$QEMU_BIN" ]]; then
        echo "Could not find a suitable qemu binary" >&2
        return 1
    fi
}

# Compares argument #1=X.Y.Z (X&Y&Z = numeric) to the version of the installed qemu
# returns 0 if newer or equal
# returns 1 if older
# returns 2 if failing
qemu_min_version() {
    find_qemu_bin || return 2

    # get version from binary
    local qemu_ver
    qemu_ver="$("$QEMU_BIN" --version | awk '/^QEMU emulator version ([0-9]*\.[0-9]*\.[0-9]*)/ {print $4}')"

    # Check version string format
    echo "$qemu_ver" | grep -q '^[0-9]*\.[0-9]*\.[0-9]*$' || return 2
    echo "$1" | grep -q '^[0-9]*\.[0-9]*\.[0-9]*$' || return 2

    # compare as last command to return that value
    printf "%s\n%s\n" "$1" "$qemu_ver" | sort -V -C
}

# Return 0 if qemu did run (then you must check the result state/logs for actual
# success), or 1 if qemu is not available.
run_qemu() {
    # If the test provided its own initrd, use it (e.g. TEST-24)
    if [[ -z "$INITRD" && -f "${TESTDIR:?}/initrd.img" ]]; then
        INITRD="$TESTDIR/initrd.img"
    fi

    if [ -f /etc/machine-id ]; then
        read -r MACHINE_ID </etc/machine-id
        [ -z "$INITRD" ] && [ -e "$EFI_MOUNT/$MACHINE_ID/$KERNEL_VER/initrd" ] \
            && INITRD="$EFI_MOUNT/$MACHINE_ID/$KERNEL_VER/initrd"
        [ -z "$KERNEL_BIN" ] && [ -e "$EFI_MOUNT/$MACHINE_ID/$KERNEL_VER/linux" ] \
            && KERNEL_BIN="$EFI_MOUNT/$MACHINE_ID/$KERNEL_VER/linux"
    fi

    local CONSOLE=ttyS0

    rm -f "$initdir"/{testok,failed,skipped}
    # make sure the initdir is not mounted to avoid concurrent access
    cleanup_initdir
    umount_loopback

    if [[ ! "$KERNEL_BIN" ]]; then
        if get_bool "$LOOKS_LIKE_ARCH"; then
            KERNEL_BIN=/boot/vmlinuz-linux
        else
            [ "$ARCH" ] || ARCH=$(uname -m)
            case $ARCH in
                ppc64*)
                    # Ubuntu ppc64* calls the kernel binary as vmlinux-*, RHEL/CentOS
                    # uses the "standard" vmlinuz- prefix
                    [[ -e "/boot/vmlinux-$KERNEL_VER" ]] && KERNEL_BIN="/boot/vmlinux-$KERNEL_VER" || KERNEL_BIN="/boot/vmlinuz-$KERNEL_VER"
                    CONSOLE=hvc0
                    ;;
                *)
                    KERNEL_BIN="/boot/vmlinuz-$KERNEL_VER"
                    ;;
            esac
        fi
    fi

    local default_fedora_initrd="/boot/initramfs-${KERNEL_VER}.img"
    local default_debian_initrd="/boot/initrd.img-${KERNEL_VER}"
    local default_arch_initrd="/boot/initramfs-linux-fallback.img"
    local default_suse_initrd="/boot/initrd-${KERNEL_VER}"
    if [[ ! "$INITRD" ]]; then
        if [[ -e "$default_fedora_initrd" ]]; then
            INITRD="$default_fedora_initrd"
        elif [[ "$LOOKS_LIKE_DEBIAN" && -e "$default_debian_initrd" ]]; then
            INITRD="$default_debian_initrd"
        elif [[ "$LOOKS_LIKE_ARCH" && -e "$default_arch_initrd" ]]; then
            INITRD="$default_arch_initrd"
        elif [[ "$LOOKS_LIKE_SUSE" && -e "$default_suse_initrd" ]]; then
            INITRD="$default_suse_initrd"
        fi
    fi

    # If QEMU_SMP was not explicitly set, try to determine the value 'dynamically'
    # i.e. use the number of online CPUs on the host machine. If the nproc utility
    # is not installed or there's some other error when calling it, fall back
    # to the original value (QEMU_SMP=1).
    if [[ -z "${QEMU_SMP:=}" ]]; then
        if ! QEMU_SMP=$(nproc); then
            dwarn "nproc utility is not installed, falling back to QEMU_SMP=1"
            QEMU_SMP=1
        fi
    fi

    find_qemu_bin || return 1

    # Umount initdir to avoid concurrent access to the filesystem
    _umount_dir "$initdir"

    local kernel_params=()
    local qemu_options=()
    local qemu_cmd=("$QEMU_BIN")

    if [[ "$UNIFIED_CGROUP_HIERARCHY" = "yes" ]]; then
        kernel_params+=("systemd.unified_cgroup_hierarchy=yes")
    elif [[ "$UNIFIED_CGROUP_HIERARCHY" = "no" ]]; then
        kernel_params+=("systemd.unified_cgroup_hierarchy=no" "systemd.legacy_systemd_cgroup_controller=yes")
    elif [[ "$UNIFIED_CGROUP_HIERARCHY" = "hybrid" ]]; then
        kernel_params+=("systemd.unified_cgroup_hierarchy=no" "systemd.legacy_systemd_cgroup_controller=no")
    elif [[ "$UNIFIED_CGROUP_HIERARCHY" != "default" ]]; then
        dfatal "Unknown UNIFIED_CGROUP_HIERARCHY. Got $UNIFIED_CGROUP_HIERARCHY, expected [yes|no|hybrid|default]"
        exit 1
    fi

    if get_bool "$LOOKS_LIKE_SUSE"; then
        kernel_params+=("rd.hostonly=0")
    fi

    kernel_params+=(
        "root=LABEL=systemd_boot"
        "rw"
        "raid=noautodetect"
        "rd.luks=0"
        "loglevel=2"
        "init=$PATH_TO_INIT"
        "console=$CONSOLE"
        "SYSTEMD_UNIT_PATH=/usr/lib/systemd/tests/testdata/testsuite-$1.units:/usr/lib/systemd/tests/testdata/units:"
        "systemd.unit=testsuite.target"
        "systemd.wants=testsuite-$1.service"
    )

    if ! get_bool "$INTERACTIVE_DEBUG"; then
        kernel_params+=("systemd.wants=end.service")
    fi

    [ -e "$IMAGE_PRIVATE" ] && image="$IMAGE_PRIVATE" || image="$IMAGE_PUBLIC"
    qemu_options+=(
        -smp "$QEMU_SMP"
        -net none
        -m "$QEMU_MEM"
        -nographic
        -kernel "$KERNEL_BIN"
        -drive "format=raw,cache=unsafe,file=$image"
        -device "virtio-rng-pci,max-bytes=1024,period=1000"
    )

    if [[ -n "${QEMU_OPTIONS:=}" ]]; then
        local user_qemu_options
        read -ra user_qemu_options <<< "$QEMU_OPTIONS"
        qemu_options+=("${user_qemu_options[@]}")
    fi

    if [[ -n "${KERNEL_APPEND:=}" ]]; then
        local user_kernel_append
        read -ra user_kernel_append <<< "$KERNEL_APPEND"
        kernel_params+=("${user_kernel_append[@]}")
    fi

    if [[ "$INITRD" ]] && ! get_bool "$SKIP_INITRD"; then
        qemu_options+=(-initrd "$INITRD")
    fi

    # Let's use KVM if possible
    if [[ -c /dev/kvm ]] && get_bool $QEMU_KVM; then
        qemu_options+=(-machine "accel=kvm" -enable-kvm -cpu host)
    fi

    if [[ "$QEMU_TIMEOUT" != "infinity" ]]; then
        qemu_cmd=(timeout --foreground "$QEMU_TIMEOUT" "$QEMU_BIN")
    fi

    (set -x; "${qemu_cmd[@]}" "${qemu_options[@]}" -append "${kernel_params[*]}")
    rc=$?
    if [ "$rc" -eq 124 ] && [ "$QEMU_TIMEOUT" != "infinity" ]; then
        derror "Test timed out after ${QEMU_TIMEOUT}s"
        TIMED_OUT=1
    else
        [ "$rc" != 0 ] && derror "qemu failed with exit code $rc"
    fi
    return 0
}

# Return 0 if nspawn did run (then you must check the result state/logs for actual
# success), or 1 if nspawn is not available.
run_nspawn() {
    [[ -d /run/systemd/system ]] || return 1
    rm -f "${initdir:?}"/{testok,failed,skipped}

    local nspawn_cmd=()
    local nspawn_options=(
        "--register=no"
        "--kill-signal=SIGKILL"
        "--directory=${1:?}"
        "--setenv=SYSTEMD_UNIT_PATH=/usr/lib/systemd/tests/testdata/testsuite-$2.units:/usr/lib/systemd/tests/testdata/units:"
    )
    local kernel_params=(
        "$PATH_TO_INIT"
        "systemd.unit=testsuite.target"
        "systemd.wants=testsuite-$2.service"
    )

    if ! get_bool "$INTERACTIVE_DEBUG"; then
        kernel_params+=("systemd.wants=end.service")
    fi

    if [[ -n "${NSPAWN_ARGUMENTS:=}" ]]; then
        local user_nspawn_arguments
        read -ra user_nspawn_arguments <<< "$NSPAWN_ARGUMENTS"
        nspawn_options+=("${user_nspawn_arguments[@]}")
    fi

    if [[ -n "${KERNEL_APPEND:=}" ]]; then
        local user_kernel_append
        read -ra user_kernel_append <<< "$KERNEL_APPEND"
        kernel_params+=("${user_kernel_append[@]}")
    fi

    if [[ "$UNIFIED_CGROUP_HIERARCHY" = "hybrid" ]]; then
        dwarn "nspawn doesn't support SYSTEMD_NSPAWN_UNIFIED_HIERARCHY=hybrid, skipping"
        exit
    elif [[ "$UNIFIED_CGROUP_HIERARCHY" = "yes" || "$UNIFIED_CGROUP_HIERARCHY" = "no" ]]; then
        nspawn_cmd+=(env "SYSTEMD_NSPAWN_UNIFIED_HIERARCHY=$UNIFIED_CGROUP_HIERARCHY")
    elif [[ "$UNIFIED_CGROUP_HIERARCHY" = "default" ]]; then
        nspawn_cmd+=(env "--unset=UNIFIED_CGROUP_HIERARCHY" "--unset=SYSTEMD_NSPAWN_UNIFIED_HIERARCHY")
    else
        dfatal "Unknown UNIFIED_CGROUP_HIERARCHY. Got $UNIFIED_CGROUP_HIERARCHY, expected [yes|no|hybrid|default]"
        exit 1
    fi

    if [[ "$NSPAWN_TIMEOUT" != "infinity" ]]; then
        nspawn_cmd+=(timeout --foreground "$NSPAWN_TIMEOUT" "$SYSTEMD_NSPAWN")
    else
        nspawn_cmd+=("$SYSTEMD_NSPAWN")
    fi

    (set -x; "${nspawn_cmd[@]}" "${nspawn_options[@]}" "${kernel_params[@]}")
    rc=$?
    if [ "$rc" -eq 124 ] && [ "$NSPAWN_TIMEOUT" != "infinity" ]; then
        derror "Test timed out after ${NSPAWN_TIMEOUT}s"
        TIMED_OUT=1
    else
        [ "$rc" != 0 ] && derror "nspawn failed with exit code $rc"
    fi
    return 0
}

# Build two very minimal root images, with two units, one is the same and one is different across them
install_verity_minimal() {
    dinfo "Set up a set of minimal images for verity verification"
    if [ -e "$initdir/usr/share/minimal.raw" ]; then
        return
    fi
    if ! command -v mksquashfs >/dev/null 2>&1; then
        dfatal "mksquashfs not found"
        exit 1
    fi
    if ! command -v veritysetup >/dev/null 2>&1; then
        dfatal "veritysetup not found"
        exit 1
    fi
    # Local modifications of some global variables is intentional in this
    # subshell (SC2030)
    # shellcheck disable=SC2030
    (
        BASICTOOLS=(
            bash
            cat
            grep
            mount
            sleep
        )
        oldinitdir="$initdir"
        rm -rfv "$TESTDIR/minimal"
        export initdir="$TESTDIR/minimal"
        # app0 will use TemporaryFileSystem=/var/lib, app1 will need the mount point in the base image
        mkdir -p "$initdir/usr/lib/systemd/system" "$initdir/usr/lib/extension-release.d" "$initdir/etc" "$initdir/var/tmp" "$initdir/opt" "$initdir/var/lib/app1"
        setup_basic_dirs
        install_basic_tools
        # Shellcheck treats [[ -v VAR ]] as an assignment to avoid a different
        # issue, thus falsely triggering SC2030 in this case
        # See: koalaman/shellcheck#1409
        if [[ -v ASAN_RT_PATH ]]; then
            # If we're compiled with ASan, install the ASan RT (and its dependencies)
            # into the verity images to get rid of the annoying errors about
            # missing $LD_PRELOAD libraries.
            inst_libs "$ASAN_RT_PATH"
            inst_library "$ASAN_RT_PATH"
            # Create a dummy LSan suppression file otherwise gcc's ASan
            # complains as it doesn't exist in the minimal image
            # (i.e. when running TEST-29 or TEST-50 under sanitizers)
            touch "$initdir/systemd-lsan.supp"
        fi
        cp "$os_release" "$initdir/usr/lib/os-release"
        ln -s ../usr/lib/os-release "$initdir/etc/os-release"
        touch "$initdir/etc/machine-id" "$initdir/etc/resolv.conf"
        touch "$initdir/opt/some_file"
        echo MARKER=1 >>"$initdir/usr/lib/os-release"
        echo "PORTABLE_PREFIXES=app0 minimal minimal-app0" >>"$initdir/usr/lib/os-release"
        cat >"$initdir/usr/lib/systemd/system/minimal-app0.service" <<EOF
[Service]
ExecStartPre=cat /usr/lib/os-release
ExecStart=sleep 120
EOF
        cp "$initdir/usr/lib/systemd/system/minimal-app0.service" "$initdir/usr/lib/systemd/system/minimal-app0-foo.service"

        mksquashfs "$initdir" "$oldinitdir/usr/share/minimal_0.raw" -noappend
        veritysetup format "$oldinitdir/usr/share/minimal_0.raw" "$oldinitdir/usr/share/minimal_0.verity" | \
            grep '^Root hash:' | cut -f2 | tr -d '\n' >"$oldinitdir/usr/share/minimal_0.roothash"

        sed -i "s/MARKER=1/MARKER=2/g" "$initdir/usr/lib/os-release"
        rm "$initdir/usr/lib/systemd/system/minimal-app0-foo.service"
        cp "$initdir/usr/lib/systemd/system/minimal-app0.service" "$initdir/usr/lib/systemd/system/minimal-app0-bar.service"

        mksquashfs "$initdir" "$oldinitdir/usr/share/minimal_1.raw" -noappend
        veritysetup format "$oldinitdir/usr/share/minimal_1.raw" "$oldinitdir/usr/share/minimal_1.verity" | \
            grep '^Root hash:' | cut -f2 | tr -d '\n' >"$oldinitdir/usr/share/minimal_1.roothash"

        # Rolling distros like Arch do not set VERSION_ID
        local version_id=""
        if grep -q "^VERSION_ID=" "$os_release"; then
            version_id="$(grep "^VERSION_ID=" "$os_release")"
        fi

        export initdir="$TESTDIR/app0"
        mkdir -p "$initdir/usr/lib/extension-release.d" "$initdir/usr/lib/systemd/system" "$initdir/opt"
        grep "^ID=" "$os_release" >"$initdir/usr/lib/extension-release.d/extension-release.app0"
        echo "${version_id}" >>"$initdir/usr/lib/extension-release.d/extension-release.app0"
        cat >"$initdir/usr/lib/systemd/system/app0.service" <<EOF
[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/opt/script0.sh
TemporaryFileSystem=/var/lib
StateDirectory=app0
RuntimeDirectory=app0
EOF
        cat >"$initdir/opt/script0.sh" <<EOF
#!/bin/bash
set -e
test -e /usr/lib/os-release
echo bar > \${STATE_DIRECTORY}/foo
cat /usr/lib/extension-release.d/extension-release.app0
EOF
        chmod +x "$initdir/opt/script0.sh"
        echo MARKER=1 >"$initdir/usr/lib/systemd/system/some_file"
        mksquashfs "$initdir" "$oldinitdir/usr/share/app0.raw" -noappend

        export initdir="$TESTDIR/app1"
        mkdir -p "$initdir/usr/lib/extension-release.d" "$initdir/usr/lib/systemd/system" "$initdir/opt"
        grep "^ID=" "$os_release" >"$initdir/usr/lib/extension-release.d/extension-release.app2"
        ( echo "${version_id}"
          echo "SYSEXT_SCOPE=portable"
          echo "PORTABLE_PREFIXES=app1" ) >>"$initdir/usr/lib/extension-release.d/extension-release.app2"
        setfattr -n user.extension-release.strict -v false "$initdir/usr/lib/extension-release.d/extension-release.app2"
        cat >"$initdir/usr/lib/systemd/system/app1.service" <<EOF
[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/opt/script1.sh
StateDirectory=app1
RuntimeDirectory=app1
EOF
        cat >"$initdir/opt/script1.sh" <<EOF
#!/bin/bash
set -e
test -e /usr/lib/os-release
echo baz > \${STATE_DIRECTORY}/foo
cat /usr/lib/extension-release.d/extension-release.app2
EOF
        chmod +x "$initdir/opt/script1.sh"
        echo MARKER=1 >"$initdir/usr/lib/systemd/system/other_file"
        mksquashfs "$initdir" "$oldinitdir/usr/share/app1.raw" -noappend
    )
}

setup_basic_environment() {
    # create the basic filesystem layout
    setup_basic_dirs

    install_systemd
    install_missing_libraries
    install_config_files
    install_zoneinfo
    create_rc_local
    install_basic_tools
    install_libnss
    install_pam
    install_dbus
    install_fonts
    install_keymaps
    install_terminfo
    install_execs
    install_fs_tools
    install_modules
    install_plymouth
    install_haveged
    install_debug_tools
    install_ld_so_conf
    install_testuser
    has_user_dbus_socket && install_user_dbus
    setup_selinux
    strip_binaries
    instmods veth
    install_depmod_files
    generate_module_dependencies
    if get_bool "$IS_BUILT_WITH_ASAN"; then
        create_asan_wrapper
    fi
    if get_bool "$TEST_INSTALL_VERITY_MINIMAL"; then
        install_verity_minimal
    fi
}

setup_selinux() {
    dinfo "Setup SELinux"
    # don't forget KERNEL_APPEND='... selinux=1 ...'
    if ! get_bool "$SETUP_SELINUX"; then
        dinfo "SETUP_SELINUX != yes, skipping SELinux configuration"
        return 0
    fi

    local conf_dir=/etc/selinux
    local fixfiles_tools=(bash uname cat sort uniq awk grep egrep head expr find rm secon setfiles)

    # Make sure the following statement can't expand to "/" to prevent
    # a potential where-are-my-backups situation
    rm -rf "${initdir:?}/$conf_dir"
    if ! cp -ar "$conf_dir" "$initdir/$conf_dir"; then
        dfatal "Failed to copy $conf_dir"
        exit 1
    fi

    touch "$initdir/.autorelabel"
    mkdir -p "$initdir/usr/lib/systemd/tests/testdata/units/basic.target.wants"
    ln -sf ../autorelabel.service "$initdir/usr/lib/systemd/tests/testdata/units/basic.target.wants/"

    image_install "${fixfiles_tools[@]}"
    image_install fixfiles
    image_install sestatus
}

install_valgrind() {
    if ! type -p valgrind; then
        dfatal "Failed to install valgrind"
        exit 1
    fi

    local valgrind_bins valgrind_libs valgrind_dbg_and_supp

    readarray -t valgrind_bins < <(strace -e execve valgrind /bin/true 2>&1 >/dev/null | perl -lne 'print $1 if /^execve\("([^"]+)"/')
    image_install "${valgrind_bins[@]}"

    readarray -t valgrind_libs < <(LD_DEBUG=files valgrind /bin/true 2>&1 >/dev/null | perl -lne 'print $1 if m{calling init: (/.*vgpreload_.*)}')
    image_install "${valgrind_libs[@]}"

    readarray -t valgrind_dbg_and_supp < <(
        strace -e open valgrind /bin/true 2>&1 >/dev/null |
        perl -lne 'if (my ($fname) = /^open\("([^"]+).*= (?!-)\d+/) { print $fname if $fname =~ /debug|\.supp$/ }'
    )
    image_install "${valgrind_dbg_and_supp[@]}"
}

create_valgrind_wrapper() {
    local valgrind_wrapper="$initdir/$ROOTLIBDIR/systemd-under-valgrind"
    ddebug "Create $valgrind_wrapper"
    cat >"$valgrind_wrapper" <<EOF
#!/usr/bin/env bash

mount -t proc proc /proc
exec valgrind --leak-check=full --track-fds=yes --log-file=/valgrind.out $ROOTLIBDIR/systemd "\$@"
EOF
    chmod 0755 "$valgrind_wrapper"
}

create_asan_wrapper() {
    local asan_wrapper="$initdir/$ROOTLIBDIR/systemd-under-asan"
    dinfo "Create ASan wrapper as '$asan_wrapper'"

    [[ -z "$ASAN_RT_PATH" ]] && dfatal "ASAN_RT_PATH is empty, but it shouldn't be"

    # clang: install llvm-symbolizer to generate useful reports
    # See: https://clang.llvm.org/docs/AddressSanitizer.html#symbolizing-the-reports
    [[ "$ASAN_COMPILER" == "clang" ]] && image_install "llvm-symbolizer"

    cat >"$asan_wrapper" <<EOF
#!/usr/bin/env bash

set -x

echo "ASan RT: $ASAN_RT_PATH"
if [[ ! -e "$ASAN_RT_PATH" ]]; then
    echo >&2 "Couldn't find ASan RT at '$ASAN_RT_PATH', can't continue"
    exit 1
fi

# Suppress certain leaks reported by LSan (either in external tools or bogus
# ones)
# Docs: # https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer#suppressions
#
# - fsck is called by systemd-homed and is reporting a leak we're not interested
#   in
# - libLLVM is a "side effect" caused by the previous fsck leak
cat >/systemd-lsan.supp <<INNER_EOF
leak:/bin/fsck$
leak:/sbin/fsck$
leak:/lib/libLLVM
INNER_EOF

DEFAULT_LSAN_OPTIONS=${LSAN_OPTIONS:-}:suppressions=/systemd-lsan.supp
DEFAULT_ASAN_OPTIONS=${ASAN_OPTIONS:-strict_string_checks=1:detect_stack_use_after_return=1:check_initialization_order=1:strict_init_order=1}
DEFAULT_UBSAN_OPTIONS=${UBSAN_OPTIONS:-print_stacktrace=1:print_summary=1:halt_on_error=1}
DEFAULT_ENVIRONMENT="ASAN_OPTIONS=\$DEFAULT_ASAN_OPTIONS UBSAN_OPTIONS=\$DEFAULT_UBSAN_OPTIONS LSAN_OPTIONS=\$DEFAULT_LSAN_OPTIONS"

# As right now bash is the PID 1, we can't expect PATH to have a sane value.
# Let's make one to prevent unexpected "<bin> not found" issues in the future
export PATH="/sbin:/bin:/usr/sbin:/usr/bin"

mount -t proc proc /proc
mount -t sysfs sysfs /sys
mount -o remount,rw /

# A lot of services (most notably dbus) won't start without preloading libasan
# See https://github.com/systemd/systemd/issues/5004
DEFAULT_ENVIRONMENT="\$DEFAULT_ENVIRONMENT LD_PRELOAD=$ASAN_RT_PATH ASAN_RT_PATH=$ASAN_RT_PATH"

if [[ "$ASAN_COMPILER" == "clang" ]]; then
  # Let's add the ASan DSO's path to the dynamic linker's cache. This is pretty
  # unnecessary for gcc & libasan, however, for clang this is crucial, as its
  # runtime ASan DSO is in a non-standard (library) path.
  echo "${ASAN_RT_PATH%/*}" >/etc/ld.so.conf.d/asan-path-override.conf
  ldconfig
fi
echo DefaultEnvironment=\$DEFAULT_ENVIRONMENT >>/etc/systemd/system.conf
echo DefaultTimeoutStartSec=180s >>/etc/systemd/system.conf
echo DefaultStandardOutput=journal+console >>/etc/systemd/system.conf

# ASAN and syscall filters aren't compatible with each other.
find / -name '*.service' -type f | xargs sed -i 's/^\\(MemoryDeny\\|SystemCall\\)/#\\1/'

# The redirection of ASAN reports to a file prevents them from ending up in /dev/null.
# But, apparently, sometimes it doesn't work: https://github.com/google/sanitizers/issues/886.
JOURNALD_CONF_DIR=/etc/systemd/system/systemd-journald.service.d
mkdir -p "\$JOURNALD_CONF_DIR"
printf "[Service]\nEnvironment=ASAN_OPTIONS=\$DEFAULT_ASAN_OPTIONS:log_path=/systemd-journald.asan.log UBSAN_OPTIONS=\$DEFAULT_UBSAN_OPTIONS:log_path=/systemd-journald.ubsan.log\n" >"\$JOURNALD_CONF_DIR/env.conf"

# Sometimes UBSan sends its reports to stderr regardless of what is specified in log_path
# Let's try to catch them by redirecting stderr (and stdout just in case) to a file
# See https://github.com/systemd/systemd/pull/12524#issuecomment-491108821
printf "[Service]\nStandardOutput=file:/systemd-journald.out\n" >"\$JOURNALD_CONF_DIR/out.conf"

# 90s isn't enough for some services to finish when literally everything is run
# under ASan+UBSan in containers, which, in turn, are run in VMs.
# Let's limit which environments such services should be executed in.
mkdir -p /etc/systemd/system/systemd-hwdb-update.service.d
printf "[Unit]\nConditionVirtualization=container\n\n[Service]\nTimeoutSec=240s\n" >/etc/systemd/system/systemd-hwdb-update.service.d/env-override.conf

# Let's override another hard-coded timeout that kicks in too early
mkdir -p /etc/systemd/system/systemd-journal-flush.service.d
printf "[Service]\nTimeoutSec=180s\n" >/etc/systemd/system/systemd-journal-flush.service.d/timeout.conf

# D-Bus has troubles during system shutdown causing it to fail. Although it's
# harmless, it causes unnecessary noise in the logs, so let's disable LSan's
# at_exit check just for the dbus.service
mkdir -p /etc/systemd/system/dbus.service.d
printf "[Service]\nEnvironment=ASAN_OPTIONS=leak_check_at_exit=false\n" >/etc/systemd/system/dbus.service.d/disable-lsan.conf

# Some utilities run via IMPORT/RUN/PROGRAM udev directives fail because
# they're uninstrumented (like dmsetup). Let's add a simple rule which sets
# LD_PRELOAD to the ASan RT library to fix this.
mkdir -p /etc/udev/rules.d
cat >/etc/udev/rules.d/00-set-LD_PRELOAD.rules <<INNER_EOF
SUBSYSTEM=="block", ENV{LD_PRELOAD}="$ASAN_RT_PATH"
INNER_EOF
chmod 0644 /etc/udev/rules.d/00-set-LD_PRELOAD.rules

# The 'mount' utility doesn't behave well under libasan, causing unexpected
# fails during boot and subsequent test results check:
# bash-5.0# mount -o remount,rw -v /
# mount: /dev/sda1 mounted on /.
# bash-5.0# echo \$?
# 1
# Let's workaround this by clearing the previously set LD_PRELOAD env variable,
# so the libasan library is not loaded for this particular service
unset_ld_preload() {
    local _dropin_dir="/etc/systemd/system/\$1.service.d"
    mkdir -p "\$_dropin_dir"
    printf "[Service]\nUnsetEnvironment=LD_PRELOAD\n" >"\$_dropin_dir/unset_ld_preload.conf"
}

unset_ld_preload systemd-remount-fs
unset_ld_preload testsuite-

export ASAN_OPTIONS=\$DEFAULT_ASAN_OPTIONS:log_path=/systemd.asan.log UBSAN_OPTIONS=\$DEFAULT_UBSAN_OPTIONS
exec "$ROOTLIBDIR/systemd" "\$@"
EOF

    chmod 0755 "$asan_wrapper"
}

create_strace_wrapper() {
    local strace_wrapper="$initdir/$ROOTLIBDIR/systemd-under-strace"
    ddebug "Create $strace_wrapper"
    cat >"$strace_wrapper" <<EOF
#!/usr/bin/env bash

exec strace -f -D -o /strace.out "$ROOTLIBDIR/systemd" "\$@"
EOF
    chmod 0755 "$strace_wrapper"
}

install_fs_tools() {
    dinfo "Install fsck"
    image_install /sbin/fsck*
    image_install -o /bin/fsck*

    # fskc.reiserfs calls reiserfsck. so, install it
    image_install -o reiserfsck

    # we use mkfs in system-repart tests
    image_install /sbin/mkfs.ext4
    image_install /sbin/mkfs.vfat
}

install_modules() {
    dinfo "Install modules"

    instmods loop
    instmods vfat
    instmods nls_ascii =nls
    instmods dummy

    if get_bool "$LOOKS_LIKE_SUSE"; then
        instmods ext4
    fi
}

install_dmevent() {
    instmods dm_crypt =crypto
    inst_binary dmeventd
    image_install "${ROOTLIBDIR:?}"/system/dm-event.{service,socket}
    if get_bool "$LOOKS_LIKE_DEBIAN"; then
        # dmsetup installs 55-dm and 60-persistent-storage-dm on Debian/Ubuntu
        # and since buster/bionic 95-dm-notify.rules
        # see https://gitlab.com/debian-lvm/lvm2/blob/master/debian/patches/udev.patch
        inst_rules 55-dm.rules 60-persistent-storage-dm.rules 95-dm-notify.rules
    else
        inst_rules 10-dm.rules 13-dm-disk.rules 95-dm-notify.rules
    fi
    if get_bool "$LOOKS_LIKE_SUSE"; then
        inst_rules 60-persistent-storage.rules 61-persistent-storage-compat.rules 99-systemd.rules
    fi
}

install_multipath() {
    instmods "=md" multipath
    image_install kpartx /lib/udev/kpartx_id lsmod mpathpersist multipath multipathd partx
    image_install "${ROOTLIBDIR:?}"/system/multipathd.{service,socket}
    if get_bool "$LOOKS_LIKE_DEBIAN"; then
        inst_rules 56-dm-parts.rules 56-dm-mpath.rules 60-multipath.rules 68-del-part-nodes.rules 95-kpartx.rules
    else
        inst_rules 11-dm-mpath.rules 11-dm-parts.rules 62-multipath.rules 66-kpartx.rules 68-del-part-nodes.rules
    fi
    mkdir -p "${initdir:?}/etc/multipath"

    local file
    while read -r file; do
        # Install libraries required by the given library
        inst_libs "$file"
        # Install the library itself and create necessary symlinks
        inst_library "$file"
    done < <(find /lib*/multipath -type f)

    if get_bool "$LOOKS_LIKE_ARCH"; then
        # On Arch the multipath libraries are not linked against libgcc_s.so.1,
        # but it's still required at runtime
        inst_library "/lib64/libgcc_s.so.1"
    fi
}

install_lvm() {
    image_install lvm
    image_install "${ROOTLIBDIR:?}"/system/lvm2-lvmpolld.{service,socket}
    image_install "${ROOTLIBDIR:?}"/system/{blk-availability,lvm2-monitor}.service
    image_install -o "/lib/tmpfiles.d/lvm2.conf"
    if get_bool "$LOOKS_LIKE_DEBIAN"; then
        inst_rules 56-lvm.rules 69-lvm-metad.rules
    else
        # Support the new udev autoactivation introduced in lvm 2.03.14
        # https://sourceware.org/git/?p=lvm2.git;a=commit;h=67722b312390cdab29c076c912e14bd739c5c0f6
        # Static autoactivation (via lvm2-activation-generator) was dropped
        # in lvm 2.03.15
        # https://sourceware.org/git/?p=lvm2.git;a=commit;h=ee8fb0310c53ed003a43b324c99cdfd891dd1a7c
        if [[ -f /lib/udev/rules.d/69-dm-lvm.rules ]]; then
            inst_rules 11-dm-lvm.rules 69-dm-lvm.rules
        else
            image_install "${ROOTLIBDIR:?}"/system-generators/lvm2-activation-generator
            image_install "${ROOTLIBDIR:?}"/system/lvm2-pvscan@.service
            inst_rules 11-dm-lvm.rules 69-dm-lvm-metad.rules
        fi
    fi
    mkdir -p "${initdir:?}/etc/lvm"
}

install_btrfs() {
    instmods btrfs
    # Not all utilities provided by btrfs-progs are listed here; extend the list
    # if necessary
    image_install btrfs btrfstune mkfs.btrfs
    inst_rules 64-btrfs-dm.rules
}

install_iscsi() {
    # Install both client and server side stuff by default
    local inst="${1:-}"
    local file

    # Install client-side stuff ("initiator" in iSCSI jargon) - Open-iSCSI in this case
    # (open-iscsi on Debian, iscsi-initiator-utils on Fedora, etc.)
    if [[ -z "$inst" || "$inst" =~ (client|initiator) ]]; then
        image_install iscsi-iname iscsiadm iscsid iscsistart
        image_install -o "${ROOTLIBDIR:?}"/system/iscsi-{init,onboot,shutdown}.service
        image_install "${ROOTLIBDIR:?}"/system/iscsid.{service,socket}
        image_install "${ROOTLIBDIR:?}"/system/iscsi.service
        mkdir -p "${initdir:?}"/var/lib/iscsi/{ifaces,isns,nodes,send_targets,slp,static}
        mkdir -p "${initdir:?}/etc/iscsi"
        echo "iscsid.startup = /bin/systemctl start iscsid.socket" >"${initdir:?}/etc/iscsi/iscsid.conf"
        inst_simple "/etc/iscsi/initiatorname.iscsi"
    fi

    # Install server-side stuff ("target" in iSCSI jargon) - TGT in this case
    # (tgt on Debian, scsi-target-utils on Fedora, etc.)
    if [[ -z "$inst" || "$inst" =~ (server|target) ]]; then
        image_install tgt-admin tgt-setup-lun tgtadm tgtd tgtimg
        image_install -o /etc/sysconfig/tgtd
        image_install "${ROOTLIBDIR:?}"/system/tgtd.service
        mkdir -p "${initdir:?}/etc/tgt"
        touch "${initdir:?}"/etc/tgt/{tgtd,targets}.conf
        # Install perl modules required by tgt-admin
        #
        # Forgive me father for I have sinned. The monstrosity below appends
        # a perl snippet to the `tgt-admin` perl script on the fly, which
        # dumps a list of files (perl modules) required by `tgt-admin` at
        # the runtime plus any DSOs loaded via DynaLoader. This list is then
        # passed to `inst_simple` which installs the necessary files into the image
        #
        # shellcheck disable=SC2016
        while read -r file; do
            inst_simple "$file"
        done < <(perl -- <(cat "$(command -v tgt-admin)" <(echo -e 'use DynaLoader; print map { "$_\n" } values %INC; print join("\n", @DynaLoader::dl_shared_objects)')) -p | awk '/^\// { print $1 }')
    fi
}

install_mdadm() {
    local unit
    local mdadm_units=(
        system/mdadm-grow-continue@.service
        system/mdadm-last-resort@.service
        system/mdadm-last-resort@.timer
        system/mdmon@.service
        system/mdmonitor-oneshot.service
        system/mdmonitor-oneshot.timer
        system/mdmonitor.service
        system-shutdown/mdadm.shutdown
    )

    image_install mdadm mdmon
    inst_rules 01-md-raid-creating.rules 63-md-raid-arrays.rules 64-md-raid-assembly.rules 69-md-clustered-confirm-device.rules
    # Fedora/CentOS/RHEL ships this rule file
    [[ -f /lib/udev/rules.d/65-md-incremental.rules ]] && inst_rules 65-md-incremental.rules

    for unit in "${mdadm_units[@]}"; do
        image_install "${ROOTLIBDIR:?}/$unit"
    done
}

install_compiled_systemd() {
    dinfo "Install compiled systemd"

    local ninja_bin
    ninja_bin="$(type -P ninja || type -P ninja-build)"
    if [[ -z "$ninja_bin" ]]; then
        dfatal "ninja was not found"
        exit 1
    fi
    (set -x; DESTDIR="$initdir" "$ninja_bin" -C "$BUILD_DIR" install)

    # If we are doing coverage runs, copy over the binary notes files, as lcov expects to
    # find them in the same directory as the runtime data counts
    if get_bool "$IS_BUILT_WITH_COVERAGE"; then
        mkdir -p "${initdir}/${BUILD_DIR:?}/"
        rsync -am --include='*/' --include='*.gcno' --exclude='*' "${BUILD_DIR:?}/" "${initdir}/${BUILD_DIR:?}/"
        # Set effective & default ACLs for the build dir so unprivileged
        # processes can write gcda files with coverage stats
        setfacl -R -m 'd:o:rwX' -m 'o:rwX' "${initdir}/${BUILD_DIR:?}/"
    fi
}

install_debian_systemd() {
    dinfo "Install debian systemd"

    local files

    while read -r deb; do
        files="$(dpkg-query -L "$deb" 2>/dev/null)" || continue
        ddebug "Install debian files from package $deb"
        for file in $files; do
            [ -e "$file" ] || continue
            [ -d "$file" ] && continue
            inst "$file"
        done
    done < <(grep -E '^Package:' "${SOURCE_DIR}/debian/control" | cut -d ':' -f 2)
}

install_suse_systemd() {
    local testsdir=/usr/lib/systemd/tests
    local pkgs

    dinfo "Install SUSE systemd"

    pkgs=(
        systemd
        systemd-container
        systemd-coredump
        systemd-experimental
        systemd-journal-remote
        systemd-portable
        udev
    )

    for p in "${pkgs[@]}"; do
        rpm -q "$p" &>/dev/null || continue

        ddebug "Install files from package $p"
        while read -r f; do
            [ -e "$f" ] || continue
            [ -d "$f" ] && continue
            inst "$f"
        done < <(rpm -ql "$p")
    done

    # we only need testsdata dir as well as the unit tests (for
    # TEST-02-UNITTESTS) in the image.
    dinfo "Install unit tests and testdata directory"

    mkdir -p "$initdir/$testsdir"
    cp "$testsdir"/test-* "$initdir/$testsdir/"
    cp -a "$testsdir/testdata" "$initdir/$testsdir/"

    # On openSUSE, these dirs are not created at package install for now on.
    mkdir -p "$initdir/var/log/journal/remote"
}

install_distro_systemd() {
    dinfo "Install distro systemd"

    if get_bool "$LOOKS_LIKE_DEBIAN"; then
        install_debian_systemd
    elif get_bool "$LOOKS_LIKE_SUSE"; then
        install_suse_systemd
    else
        dfatal "NO_BUILD not supported for this distro"
        exit 1
    fi
}

install_systemd() {
    dinfo "Install systemd"
    if get_bool "$NO_BUILD"; then
        install_distro_systemd
    else
        install_compiled_systemd
    fi

    # remove unneeded documentation
    rm -fr "${initdir:?}"/usr/share/{man,doc}

    # enable debug logging in PID1
    echo LogLevel=debug >>"$initdir/etc/systemd/system.conf"
    if [[ -n "$TEST_SYSTEMD_LOG_LEVEL" ]]; then
        echo DefaultEnvironment=SYSTEMD_LOG_LEVEL="$TEST_SYSTEMD_LOG_LEVEL" >>"$initdir/etc/systemd/system.conf"
    fi
    # store coredumps in journal
    echo Storage=journal >>"$initdir/etc/systemd/coredump.conf"
    # Propagate SYSTEMD_UNIT_PATH to user systemd managers
    mkdir "$initdir/etc/systemd/system/user@.service.d/"
    echo -e "[Service]\nPassEnvironment=SYSTEMD_UNIT_PATH\n" >"$initdir/etc/systemd/system/user@.service.d/override.conf"

    # When built with gcov, disable ProtectSystem= and ProtectHome= in the test
    # images, since it prevents gcov to write the coverage reports (*.gcda
    # files)
    if get_bool "$IS_BUILT_WITH_COVERAGE"; then
        mkdir -p "$initdir/etc/systemd/system/service.d/"
        echo -e "[Service]\nProtectSystem=no\nProtectHome=no\n" >"$initdir/etc/systemd/system/service.d/99-gcov-override.conf"
        # Similarly, set ReadWritePaths= to the $BUILD_DIR in the test image
        # to make the coverage work with units utilizing DynamicUser=yes. Do
        # this only for services from TEST-20, as setting this system-wide
        # has many undesirable side-effects
        mkdir -p "$initdir/etc/systemd/system/test20-.service.d/"
        echo -e "[Service]\nReadWritePaths=${BUILD_DIR:?}\n" >"$initdir/etc/systemd/system/test20-.service.d/99-gcov-rwpaths-override.conf"
    fi

    # If we're built with -Dportabled=false, tests with systemd-analyze
    # --profile will fail. Since we need just the profile (text) files, let's
    # copy them into the image if they don't exist there.
    local portable_dir="${initdir:?}${ROOTLIBDIR:?}/portable"
    if [[ ! -d "$portable_dir/profile/strict" ]]; then
        dinfo "Couldn't find portable profiles in the test image"
        dinfo "Copying them directly from the source tree"
        mkdir -p "$portable_dir"
        cp -frv "${SOURCE_DIR:?}/src/portable/profile" "$portable_dir"
    fi
}

get_ldpath() {
    local rpath
    rpath="$(objdump -p "${1:?}" 2>/dev/null | awk "/R(UN)?PATH/ { print \"$initdir\" \$2 }" | paste -sd :)"

    if [ -z "$rpath" ] ; then
        echo "$BUILD_DIR"
    else
        echo "$rpath"
    fi
}

install_missing_libraries() {
    dinfo "Install missing libraries"
    # install possible missing libraries
    for i in "${initdir:?}"{,/usr}/{sbin,bin}/* "$initdir"{,/usr}/lib/systemd/{,tests/{,manual/,unsafe/}}*; do
        LD_LIBRARY_PATH="${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}$(get_ldpath "$i")" inst_libs "$i"
    done

    local lib path
    # A number of dependencies is now optional via dlopen, so the install
    # script will not pick them up, since it looks at linkage.
    for lib in libcryptsetup libidn libidn2 pwquality libqrencode tss2-esys tss2-rc tss2-mu tss2-tcti-device libfido2 libbpf libelf libdw; do
        ddebug "Searching for $lib via pkg-config"
        if pkg-config --exists "$lib"; then
                path="$(pkg-config --variable=libdir "$lib")"
                if [ -z "${path}" ]; then
                    ddebug "$lib.pc does not contain a libdir variable, skipping"
                    continue
                fi

                if ! [[ ${lib} =~ ^lib ]]; then
                        lib="lib${lib}"
                fi
                # Some pkg-config files are broken and give out the wrong paths
                # (eg: libcryptsetup), so just ignore them
                inst_libs "${path}/${lib}.so" || true
                inst_library "${path}/${lib}.so" || true
        else
            ddebug "$lib.pc not found, skipping"
            continue
        fi
    done
}

cleanup_loopdev() {
    if [ -n "${LOOPDEV:=}" ]; then
        ddebug "losetup -d $LOOPDEV"
        losetup -d "${LOOPDEV}"
        unset LOOPDEV
    fi
}

trap cleanup_loopdev EXIT INT QUIT PIPE

create_empty_image() {
    if [ -z "${IMAGE_NAME:=}" ]; then
        echo "create_empty_image: \$IMAGE_NAME not set"
        exit 1
    fi

    local size=500
    if ! get_bool "$NO_BUILD"; then
        if meson configure "${BUILD_DIR:?}" | grep 'static-lib\|standalone-binaries' | awk '{ print $2 }' | grep -q 'true'; then
            size=$((size+=200))
        fi
        if meson configure "${BUILD_DIR:?}" | grep 'link-.*-shared' | awk '{ print $2 }' | grep -q 'false'; then
            size=$((size+=200))
        fi
        if get_bool "$IS_BUILT_WITH_COVERAGE"; then
            size=$((size+=250))
        fi
    fi
    if ! get_bool "$STRIP_BINARIES"; then
        size=$((4 * size))
    fi

    echo "Setting up ${IMAGE_PUBLIC:?} (${size} MB)"
    rm -f "${IMAGE_PRIVATE:?}" "$IMAGE_PUBLIC"

    # Create the blank file to use as a root filesystem
    truncate -s "${size}M" "$IMAGE_PUBLIC"

    LOOPDEV=$(losetup --show -P -f "$IMAGE_PUBLIC")
    [ -b "$LOOPDEV" ] || return 1
    sfdisk "$LOOPDEV" <<EOF
,$((size - 50))M,L,*
,
EOF

    udevadm settle

    local label=(-L systemd_boot)
    # mkfs.reiserfs doesn't know -L. so, use --label instead
    [[ "$FSTYPE" == "reiserfs" ]] && label=(--label systemd_boot)
    if ! mkfs -t "${FSTYPE}" "${label[@]}" "${LOOPDEV}p1" -q; then
        dfatal "Failed to mkfs -t ${FSTYPE}"
        exit 1
    fi
}

mount_initdir() {
    if [ -z "${LOOPDEV:=}" ]; then
        [ -e "${IMAGE_PRIVATE:?}" ] && image="$IMAGE_PRIVATE" || image="${IMAGE_PUBLIC:?}"
        LOOPDEV="$(losetup --show -P -f "$image")"
        [ -b "$LOOPDEV" ] || return 1

        udevadm settle
    fi

    if ! mountpoint -q "${initdir:?}"; then
        mkdir -p "$initdir"
        mount "${LOOPDEV}p1" "$initdir"
        TEST_SETUP_CLEANUP_ROOTDIR=1
    fi
}

cleanup_initdir() {
    # only umount if create_empty_image_rootdir() was called to mount it
    get_bool "$TEST_SETUP_CLEANUP_ROOTDIR" && _umount_dir "${initdir:?}"
}

umount_loopback() {
    # unmount the loopback device from all places. Otherwise we risk file
    # system corruption.
    for device in $(losetup -l | awk '$6=="'"${IMAGE_PUBLIC:?}"'" {print $1}'); do
        ddebug "Unmounting all uses of $device"
        mount | awk '/^'"${device}"'p/{print $1}' | xargs --no-run-if-empty umount -v
    done
}

create_empty_image_rootdir() {
    create_empty_image
    mount_initdir
}

check_asan_reports() {
    local ret=0
    local root="${1:?}"

    if get_bool "$IS_BUILT_WITH_ASAN"; then
        ls -l "$root"
        if [[ -e "$root/systemd.asan.log.1" ]]; then
            cat "$root/systemd.asan.log.1"
            ret=$((ret+1))
        fi

        journald_report="$(find "$root" -name "systemd-journald.*san.log*" -exec cat {} \;)"
        if [[ -n "$journald_report" ]]; then
            printf "%s\n" "$journald_report"
            cat "$root/systemd-journald.out" || :
            ret=$((ret+1))
        fi

        pids="$(
            "$JOURNALCTL" -D "$root/var/log/journal" | perl -alne '
                 BEGIN {
                     %services_to_ignore = (
                         "dbus-daemon" => undef,
                         "dbus-broker-launch" => undef,
                     );
                 }
                 print $2 if /\s(\S*)\[(\d+)\]:\s*SUMMARY:\s+\w+Sanitizer/ && !exists $services_to_ignore{$1}'
        )"
        if [[ -n "$pids" ]]; then
            ret=$((ret+1))
            for pid in $pids; do
                "$JOURNALCTL" -D "$root/var/log/journal" _PID="$pid" --no-pager
            done
        fi
    fi

    return $ret
}

check_coverage_reports() {
    local root="${1:?}"

    if get_bool "$NO_BUILD"; then
        return 0
    fi
    if ! get_bool "$IS_BUILT_WITH_COVERAGE"; then
        return 0
    fi

    if [ -n "${ARTIFACT_DIRECTORY}" ]; then
        dest="${ARTIFACT_DIRECTORY}/${testname:?}.coverage-info"
    else
        dest="${TESTDIR:?}/coverage-info"
    fi

    # Create a coverage report that will later be uploaded. Remove info about
    # system libraries/headers, as we don't really care about them.
    if [[ -f "$dest" ]]; then
        # If the destination report file already exists, don't overwrite it, but
        # dump the new report in a temporary file and then merge it with the already
        # present one - this usually happens when running both "parts" of a test
        # in one run (the qemu and the nspawn part).
        lcov --directory "${root}/${BUILD_DIR:?}" --capture --output-file "${dest}.new"
        lcov --remove "${dest}.new" -o "${dest}.new" '/usr/include/*' '/usr/lib/*'
        lcov --add-tracefile "${dest}" --add-tracefile "${dest}.new" -o "${dest}"
        rm -f "${dest}.new"
    else
        lcov --directory "${root}/${BUILD_DIR:?}" --capture --output-file "${dest}"
        lcov --remove "${dest}" -o "${dest}" '/usr/include/*' '/usr/lib/*'
    fi

    # If the test logs contain lines like:
    #
    # ...systemd-resolved[735885]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-250.a.p/base-filesystem.c.gcda:Cannot open
    #
    # it means we're possibly missing some coverage since gcov can't write the stats,
    # usually due to the sandbox being too restrictive (e.g. ProtectSystem=yes,
    # ProtectHome=yes) or the $BUILD_DIR being inaccessible to non-root users - see
    # `setfacl` stuff in install_compiled_systemd().
    if ! get_bool "${IGNORE_MISSING_COVERAGE:=}" && \
       "${JOURNALCTL:?}" -q --no-pager -D "${root:?}/var/log/journal" --grep "profiling:.+?gcda:[Cc]annot open"; then
        derror "Detected possibly missing coverage, check the journal"
        return 1
    fi

    return 0
}

save_journal() {
    # Default to always saving journal
    local save="yes"

    if [ "${TEST_SAVE_JOURNAL}" = "no" ]; then
        save="no"
    elif [ "${TEST_SAVE_JOURNAL}" = "fail" ] && [ "$2" = "0" ]; then
        save="no"
    fi

    if [ -n "${ARTIFACT_DIRECTORY}" ]; then
        dest="${ARTIFACT_DIRECTORY}/${testname:?}.journal"
    else
        dest="${TESTDIR:?}/system.journal"
    fi

    for j in "${1:?}"/*; do
        if get_bool "$save"; then
            if [ "$SYSTEMD_JOURNAL_REMOTE" = "" ]; then
                cp -a "$j" "$dest"
            else
                "$SYSTEMD_JOURNAL_REMOTE" -o "$dest" --getter="$JOURNALCTL -o export -D $j"
            fi
        fi

        if [ -n "${TEST_SHOW_JOURNAL}" ]; then
            echo "---- $j ----"
            "$JOURNALCTL" --no-pager -o short-monotonic --no-hostname --priority="${TEST_SHOW_JOURNAL}" -D "$j"
        fi

        rm -r "$j"
    done

    if ! get_bool "$save"; then
        return 0
    fi

    if [ -n "${SUDO_USER}" ]; then
        setfacl -m "user:${SUDO_USER:?}:r-X" "$dest"*
    fi

    # we want to print this sometime later, so save this in a variable
    JOURNAL_LIST="$(ls -l "$dest"*)"
}

check_result_common() {
    local workspace="${1:?}"
    local ret

    if [ -s "$workspace/failed" ]; then
        # Non-empty …/failed has highest priority
        cp -a "$workspace/failed" "${TESTDIR:?}/"
        if [ -n "${SUDO_USER}" ]; then
            setfacl -m "user:${SUDO_USER:?}:r-X" "${TESTDIR:?}/"failed
        fi
        ret=1
    elif get_bool "$TIMED_OUT"; then
        echo "(timeout)" >"${TESTDIR:?}/failed"
        ret=2
    elif [ -e "$workspace/testok" ]; then
        # …/testok always counts (but with lower priority than …/failed)
        ret=0
    elif [ -e "$workspace/skipped" ]; then
        # …/skipped always counts (a message is expected)
        echo "${TESTNAME:?} was skipped:"
        cat "$workspace/skipped"
        ret=0
    else
        echo "(failed; see logs)" >"${TESTDIR:?}/failed"
        ret=3
    fi

    check_asan_reports "$workspace" || ret=4

    check_coverage_reports "$workspace" || ret=5

    save_journal "$workspace/var/log/journal" $ret

    if [ -d "${ARTIFACT_DIRECTORY}" ] && [ -f "$workspace/strace.out" ]; then
        cp "$workspace/strace.out" "${ARTIFACT_DIRECTORY}/"
    fi

    if [ ${ret:?} != 0 ] && [ -f "$TESTDIR/failed" ]; then
        echo -n "${TESTNAME:?}: "
        cat "$TESTDIR/failed"
    fi
    echo "${JOURNAL_LIST:-"No journals were saved"}"

    return ${ret:?}
}

check_result_nspawn() {
    local workspace="${1:?}"
    local ret

    check_result_common "${workspace}"
    ret=$?

    # Run additional test-specific checks if defined by check_result_nspawn_hook()
    if declare -F check_result_nspawn_hook >/dev/null; then
        if ! check_result_nspawn_hook; then
            derror "check_result_nspawn_hook() returned with EC > 0"
            ret=4
        fi
    fi

    _umount_dir "${initdir:?}"

    return $ret
}

# can be overridden in specific test
check_result_qemu() {
    local ret
    mount_initdir

    check_result_common "${initdir:?}"
    ret=$?

    _umount_dir "${initdir:?}"

    # Run additional test-specific checks if defined by check_result_qemu_hook()
    if declare -F check_result_qemu_hook >/dev/null; then
        if ! check_result_qemu_hook; then
            derror "check_result_qemu_hook() returned with EC > 0"
            ret=4
        fi
    fi

    return $ret
}

check_result_nspawn_unittests() {
    local workspace="${1:?}"
    local ret=1

    [[ -e "$workspace/testok" ]] && ret=0

    if [[ -s "$workspace/failed" ]]; then
        ret=$((ret + 1))
        echo "=== Failed test log ==="
        cat "$workspace/failed"
    else
        if [[ -s "$workspace/skipped" ]]; then
            echo "=== Skipped test log =="
            cat "$workspace/skipped"
            # We might have only skipped tests - that should not fail the job
            ret=0
        fi
        if [[ -s "$workspace/testok" ]]; then
            echo "=== Passed tests ==="
            cat "$workspace/testok"
        fi
    fi

    get_bool "${TIMED_OUT:=}" && ret=1
    check_coverage_reports "$workspace" || ret=5

    save_journal "$workspace/var/log/journal" $ret

    _umount_dir "${initdir:?}"

    return $ret
}

check_result_qemu_unittests() {
    local ret=1

    mount_initdir
    [[ -e "${initdir:?}/testok" ]] && ret=0

    if [[ -s "$initdir/failed" ]]; then
        ret=$((ret + 1))
        echo "=== Failed test log ==="
        cat "$initdir/failed"
    else
        if [[ -s "$initdir/skipped" ]]; then
            echo "=== Skipped test log =="
            cat "$initdir/skipped"
            # We might have only skipped tests - that should not fail the job
            ret=0
        fi
        if [[ -s "$initdir/testok" ]]; then
            echo "=== Passed tests ==="
            cat "$initdir/testok"
        fi
    fi

    get_bool "${TIMED_OUT:=}" && ret=1
    check_coverage_reports "$initdir" || ret=5

    save_journal "$initdir/var/log/journal" $ret

    _umount_dir "$initdir"

    return $ret
}

strip_binaries() {
    dinfo "Strip binaries"
    if ! get_bool "$STRIP_BINARIES"; then
        dinfo "STRIP_BINARIES == no, keeping binaries unstripped"
        return 0
    fi
    while read -r bin; do
        strip --strip-unneeded "$bin" |& grep -vi 'file format not recognized' | ddebug || :
    done < <(find "${initdir:?}" -executable -not -path '*/lib/modules/*.ko' -type f)
}

create_rc_local() {
    dinfo "Create rc.local"
    mkdir -p "${initdir:?}/etc/rc.d"
    cat >"$initdir/etc/rc.d/rc.local" <<EOF
#!/usr/bin/env bash
exit 0
EOF
    chmod 0755 "$initdir/etc/rc.d/rc.local"
}

install_execs() {
    ddebug "Install executables from the service files"

    local pkg_config_path="${BUILD_DIR:?}/src/core/"
    local systemunitdir userunitdir exe
    systemunitdir="$(PKG_CONFIG_PATH="$pkg_config_path" pkg-config --variable=systemdsystemunitdir systemd)"
    userunitdir="$(PKG_CONFIG_PATH="$pkg_config_path" pkg-config --variable=systemduserunitdir systemd)"
    while read -r exe; do
        # some {rc,halt}.local scripts and programs are okay to not exist, the rest should
        # also, plymouth is pulled in by rescue.service, but even there the exit code
        # is ignored; as it's not present on some distros, don't fail if it doesn't exist
        dinfo "Attempting to install $exe (based on unit file reference)"
        inst "$exe" || [ "${exe%.local}" != "$exe" ] || [ "${exe%systemd-update-done}" != "$exe" ] || [ "${exe##*/}" == "plymouth" ]
    done < <(sed -r -n 's|^Exec[a-zA-Z]*=[@+!-]*([^ ]+).*|\1|gp' "${initdir:?}"/{"$systemunitdir","$userunitdir"}/*.service | sort -u)
}

generate_module_dependencies() {
    dinfo "Generate modules dependencies"
    if [[ -d "${initdir:?}/lib/modules/${KERNEL_VER:?}" ]] && \
        ! depmod -a -b "$initdir" "$KERNEL_VER"; then
            dfatal "\"depmod -a $KERNEL_VER\" failed."
            exit 1
    fi
}

install_depmod_files() {
    dinfo "Install depmod files"
    inst "/lib/modules/${KERNEL_VER:?}/modules.order"
    inst "/lib/modules/$KERNEL_VER/modules.builtin"
}

install_plymouth() {
    dinfo "Install plymouth"
    # install plymouth, if found... else remove plymouth service files
    # if [ -x /usr/libexec/plymouth/plymouth-populate-initrd ]; then
    #     PLYMOUTH_POPULATE_SOURCE_FUNCTIONS="$TEST_BASE_DIR/test-functions" \
    #         /usr/libexec/plymouth/plymouth-populate-initrd -t $initdir
    #         image_install plymouth plymouthd
    # else
        rm -f "${initdir:?}"/{usr/lib,lib,etc}/systemd/system/plymouth* "$initdir"/{usr/lib,lib,etc}/systemd/system/*/plymouth*
    # fi
}

install_haveged() {
    # If haveged is installed, it's probably included in initrd and needs to be
    # installed in the image too.
    if [ -x /usr/sbin/haveged ]; then
        dinfo "Install haveged files"
        inst /usr/sbin/haveged
        for u in /usr/lib/systemd/system/haveged*; do
            inst "$u"
        done
    fi
}

install_ld_so_conf() {
    dinfo "Install /etc/ld.so.conf*"
    cp -a /etc/ld.so.conf* "${initdir:?}/etc"
    ldconfig -r "$initdir"
}

install_testuser() {
    dinfo "Set up a test user"
    # create unprivileged user for user manager tests
    mkdir -p "${initdir:?}/etc/sysusers.d"
    cat >"$initdir/etc/sysusers.d/testuser.conf" <<EOF
u testuser    4711     "Test User" /home/testuser
EOF

    mkdir -p "$initdir/home/testuser"
    chmod 0700 "$initdir/home/testuser"
    chown 4711:4711 "$initdir/home/testuser"
}

install_config_files() {
    dinfo "Install config files"
    inst /etc/sysconfig/init || :
    inst /etc/passwd
    inst /etc/shadow
    inst_any /etc/login.defs /usr/etc/login.defs
    inst /etc/group
    inst /etc/shells
    inst_any /etc/nsswitch.conf /usr/etc/nsswitch.conf
    inst /etc/pam.conf || :
    inst_any /etc/os-release /usr/lib/os-release
    inst /etc/localtime
    # we want an empty environment
    : >"${initdir:?}/etc/environment"
    : >"$initdir/etc/machine-id"
    : >"$initdir/etc/resolv.conf"

    # set the hostname
    echo 'H' >"$initdir/etc/hostname"

    # let's set up just one image with the traditional verbose output
    if [ "${IMAGE_NAME:?}" != "basic" ]; then
        mkdir -p "$initdir/etc/systemd/system.conf.d"
        echo -e '[Manager]\nStatusUnitFormat=name' >"$initdir/etc/systemd/system.conf.d/status.conf"
    fi
}

install_basic_tools() {
    dinfo "Install basic tools"
    image_install "${BASICTOOLS[@]}"
    image_install -o sushell
    # in Debian ldconfig is just a shell script wrapper around ldconfig.real
    image_install -o ldconfig.real
}

install_debug_tools() {
    dinfo "Install debug tools"
    image_install -o "${DEBUGTOOLS[@]}"

    if get_bool "$INTERACTIVE_DEBUG"; then
        # Set default TERM from vt220 to linux, so at least basic key shortcuts work
        local getty_override="${initdir:?}/etc/systemd/system/serial-getty@.service.d"
        mkdir -p "$getty_override"
        echo -e "[Service]\nEnvironment=TERM=linux" >"$getty_override/default-TERM.conf"

        cat >"$initdir/etc/motd" <<EOF
To adjust the terminal size use:
    export COLUMNS=xx
    export LINES=yy
or
    stty cols xx rows yy
EOF
    fi
}

install_libnss() {
    dinfo "Install libnss"
    # install libnss_files for login
    local NSS_LIBS
    mapfile -t NSS_LIBS < <(LD_DEBUG=files getent passwd 2>&1 >/dev/null | sed -n '/calling init: .*libnss_/ {s!^.* /!/!; p}')
    image_install "${NSS_LIBS[@]}"
}

install_dbus() {
    dinfo "Install dbus"
    inst "${ROOTLIBDIR:?}/system/dbus.socket"

    # Newer Fedora versions use dbus-broker by default. Let's install it if it's available.
    if [ -f "$ROOTLIBDIR/system/dbus-broker.service" ]; then
        inst "$ROOTLIBDIR/system/dbus-broker.service"
        inst_symlink /etc/systemd/system/dbus.service
        inst /usr/bin/dbus-broker
        inst /usr/bin/dbus-broker-launch
    elif [ -f "$ROOTLIBDIR/system/dbus-daemon.service" ]; then
        # Fedora rawhide replaced dbus.service with dbus-daemon.service
        inst "$ROOTLIBDIR/system/dbus-daemon.service"
        # Alias symlink
        inst_symlink /etc/systemd/system/dbus.service
    else
        inst "$ROOTLIBDIR/system/dbus.service"
    fi

    while read -r file; do
        inst "$file"
    done < <(find /etc/dbus-1 /usr/share/dbus-1 -xtype f 2>/dev/null)

    # setup policy for Type=dbus test
    mkdir -p "${initdir:?}/etc/dbus-1/system.d"
    cat >"$initdir/etc/dbus-1/system.d/systemd.test.ExecStopPost.conf" <<EOF
<?xml version="1.0"?>
<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
        "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
    <policy user="root">
        <allow own="systemd.test.ExecStopPost"/>
    </policy>
</busconfig>
EOF
}

install_user_dbus() {
    dinfo "Install user dbus"
    local userunitdir
    if ! userunitdir="$(pkg-config --variable=systemduserunitdir systemd)"; then
        dwarn "WARNING! Cannot determine userunitdir from pkg-config, assuming /usr/lib/systemd/user"
        userunitdir=/usr/lib/systemd/user
    fi

    inst "$userunitdir/dbus.socket"
    inst_symlink "$userunitdir/sockets.target.wants/dbus.socket" || inst_symlink /etc/systemd/user/sockets.target.wants/dbus.socket

    # Append the After= dependency on dbus in case it isn't already set up
    mkdir -p "${initdir:?}/etc/systemd/system/user@.service.d/"
    cat >"$initdir/etc/systemd/system/user@.service.d/dbus.conf" <<EOF
[Unit]
After=dbus.service
EOF

    # Newer Fedora versions use dbus-broker by default. Let's install it if it's available.
    if [ -f "$userunitdir/dbus-broker.service" ]; then
        inst "$userunitdir/dbus-broker.service"
        inst_symlink /etc/systemd/user/dbus.service
    elif [ -f "${ROOTLIBDIR:?}/system/dbus-daemon.service" ]; then
        # Fedora rawhide replaced dbus.service with dbus-daemon.service
        inst "$userunitdir/dbus-daemon.service"
        # Alias symlink
        inst_symlink /etc/systemd/user/dbus.service
    else
        inst "$userunitdir/dbus.service"
    fi
}

install_pam() {
    dinfo "Install PAM"
    local paths=()

    if get_bool "$LOOKS_LIKE_DEBIAN" && type -p dpkg-architecture &>/dev/null; then
        paths+=("/lib/$(dpkg-architecture -qDEB_HOST_MULTIARCH)/security")
    else
        paths+=(/lib*/security)
    fi

    for d in /etc/pam.d /{usr/,}etc/security /usr/{etc,lib}/pam.d; do
        [ -d "$d" ] && paths+=("$d")
    done

    while read -r file; do
        inst "$file"
    done < <(find "${paths[@]}" -xtype f)

    # pam_unix depends on unix_chkpwd.
    # see http://www.linux-pam.org/Linux-PAM-html/sag-pam_unix.html
    image_install -o unix_chkpwd

    # set empty root password for easy debugging
    sed -i 's/^root:x:/root::/' "${initdir:?}/etc/passwd"

    # And make sure pam_unix will accept it by making sure that
    # the PAM module has the nullok option.
    for d in /etc/pam.d /usr/{etc,lib}/pam.d; do
        [ -d "$initdir/$d" ] || continue
        sed -i '/^auth.*pam_unix.so/s/$/ nullok/' "$initdir/$d"/*
    done
}

# shellcheck disable=SC2120
install_keymaps() {
    dinfo "Install keymaps"
    # The first three paths may be deprecated.
    # It seems now the last two paths are used by many distributions.
    for i in \
        /usr/lib/kbd/keymaps/include/* \
        /usr/lib/kbd/keymaps/i386/include/* \
        /usr/lib/kbd/keymaps/i386/qwerty/us.* \
        /usr/lib/kbd/keymaps/legacy/include/* \
        /usr/lib/kbd/keymaps/legacy/i386/qwerty/us.*; do
            [[ -f "$i" ]] || continue
            inst "$i"
    done

    # When it takes any argument, then install more keymaps.
    if [[ $# -gt 1 ]]; then
        for i in \
        /usr/lib/kbd/keymaps/i386/*/* \
        /usr/lib/kbd/keymaps/legacy/i386/*/*; do
            [[ -f "$i" ]] || continue
            inst "$i"
        done
    fi
}

install_zoneinfo() {
    dinfo "Install time zones"
    inst_any /usr/share/zoneinfo/Asia/Seoul
    inst_any /usr/share/zoneinfo/Asia/Vladivostok
    inst_any /usr/share/zoneinfo/Australia/Sydney
    inst_any /usr/share/zoneinfo/Europe/Berlin
    inst_any /usr/share/zoneinfo/Europe/Dublin
    inst_any /usr/share/zoneinfo/Europe/Kiev
    inst_any /usr/share/zoneinfo/Pacific/Auckland
    inst_any /usr/share/zoneinfo/Pacific/Honolulu
    inst_any /usr/share/zoneinfo/CET
    inst_any /usr/share/zoneinfo/EET
    inst_any /usr/share/zoneinfo/UTC
}

install_fonts() {
    dinfo "Install system fonts"
    for i in \
        /usr/lib/kbd/consolefonts/eurlatgr* \
        /usr/lib/kbd/consolefonts/latarcyrheb-sun16*; do
            [[ -f "$i" ]] || continue
            inst "$i"
    done
}

install_terminfo() {
    dinfo "Install terminfo files"
    local terminfodir
    for terminfodir in /lib/terminfo /etc/terminfo /usr/share/terminfo; do
        [ -f "${terminfodir}/l/linux" ] && break
    done
    image_install -o "${terminfodir}/l/linux"
}

has_user_dbus_socket() {
    if [ -f /usr/lib/systemd/user/dbus.socket ] || [ -f /etc/systemd/user/dbus.socket ]; then
        return 0
    else
        echo "Per-user instances are not supported. Skipping..."
        return 1
    fi
}

setup_nspawn_root_hook() { :;}

setup_nspawn_root() {
    if [ -z "${initdir}" ]; then
        dfatal "\$initdir not defined"
        exit 1
    fi

    rm -rf "${TESTDIR:?}/unprivileged-nspawn-root"

    if get_bool "$RUN_IN_UNPRIVILEGED_CONTAINER"; then
        ddebug "cp -ar $initdir $TESTDIR/unprivileged-nspawn-root"
        cp -ar "$initdir" "$TESTDIR/unprivileged-nspawn-root"
    fi

    setup_nspawn_root_hook
}

setup_basic_dirs() {
    mkdir -p "${initdir:?}/run"
    mkdir -p "$initdir/etc/systemd/system"
    mkdir -p "$initdir/var/log/journal"


    for d in usr/bin usr/sbin bin etc lib "${libdir:?}" sbin tmp usr var var/log var/tmp dev proc sys sysroot root run run/lock run/initramfs; do
        if [ -L "/$d" ]; then
            inst_symlink "/$d"
        else
            inst_dir "/$d"
        fi
    done

    ln -sfn /run "$initdir/var/run"
    ln -sfn /run/lock "$initdir/var/lock"
}

mask_supporting_services() {
    # mask some services that we do not want to run in these tests
    ln -fsv /dev/null "${initdir:?}/etc/systemd/system/systemd-hwdb-update.service"
    ln -fsv /dev/null "$initdir/etc/systemd/system/systemd-journal-catalog-update.service"
    ln -fsv /dev/null "$initdir/etc/systemd/system/systemd-networkd.service"
    ln -fsv /dev/null "$initdir/etc/systemd/system/systemd-networkd.socket"
    ln -fsv /dev/null "$initdir/etc/systemd/system/systemd-resolved.service"
}

inst_libs() {
    local bin="${1:?}"
    local so_regex='([^ ]*/lib[^/]*/[^ ]*\.so[^ ]*)'
    local file line

    while read -r line; do
        [[ "$line" = 'not a dynamic executable' ]] && break
        # Ignore errors about our own stuff missing. This is most likely caused
        # by ldd attempting to use the unprefixed RPATH.
        [[ "$line" =~ libsystemd.*\ not\ found ]] && continue

        if [[ "$line" =~ $so_regex ]]; then
            file="${BASH_REMATCH[1]}"
            [[ -e "${initdir:?}/$file" ]] && continue
            inst_library "$file"
            continue
        fi

        if [[ "$line" =~ not\ found ]]; then
            dfatal "Missing a shared library required by $bin."
            dfatal "Run \"ldd $bin\" to find out what it is."
            dfatal "$line"
            dfatal "Cannot create a test image."
            exit 1
        fi
    done < <(LC_ALL=C ldd "$bin" 2>/dev/null)
}

import_testdir() {
    # make sure we don't get a stale LOOPDEV value from old times
    local _LOOPDEV="${LOOPDEV:=}"
    # We don't want shellcheck to follow & check the $STATEFILE
    # shellcheck source=/dev/null
    [[ -e "$STATEFILE" ]] && . "$STATEFILE"
    LOOPDEV="$_LOOPDEV"
    if [[ ! -d "$TESTDIR" ]]; then
        if [[ -z "$TESTDIR" ]]; then
            TESTDIR="$(mktemp --tmpdir=/var/tmp -d -t systemd-test.XXXXXX)"
        else
            mkdir -p "$TESTDIR"
        fi

        cat >"$STATEFILE" <<EOF
TESTDIR="$TESTDIR"
EOF
        export TESTDIR
    fi

    IMAGE_PRIVATE="${TESTDIR}/${IMAGE_NAME:?}.img"
    IMAGE_PUBLIC="${IMAGESTATEDIR:?}/${IMAGE_NAME}.img"
}

import_initdir() {
    initdir="${TESTDIR:?}/root"
    mkdir -p "$initdir"
    export initdir
}

get_cgroup_hierarchy() {
    case "$(stat -c '%T' -f /sys/fs/cgroup)" in
        cgroup2fs)
            echo "unified"
            ;;
        tmpfs)
            if [[ -d /sys/fs/cgroup/unified && "$(stat -c '%T' -f /sys/fs/cgroup/unified)" == cgroup2fs ]]; then
                echo "hybrid"
            else
                echo "legacy"
            fi
            ;;
        *)
            dfatal "Failed to determine host's cgroup hierarchy"
            exit 1
    esac
}

## @brief Converts numeric logging level to the first letter of level name.
#
# @param lvl Numeric logging level in range from 1 to 6.
# @retval 1 if @a lvl is out of range.
# @retval 0 if @a lvl is correct.
# @result Echoes first letter of level name.
_lvl2char() {
    case "$1" in
        1) echo F;;
        2) echo E;;
        3) echo W;;
        4) echo I;;
        5) echo D;;
        6) echo T;;
        *) return 1;;
    esac
}

## @brief Internal helper function for _do_dlog()
#
# @param lvl Numeric logging level.
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
#
# @note This function is not supposed to be called manually. Please use
# dtrace(), ddebug(), or others instead which wrap this one.
#
# This function calls _do_dlog() either with parameter msg, or if
# none is given, it will read standard input and will use every line as
# a message.
#
# This enables:
# dwarn "This is a warning"
# echo "This is a warning" | dwarn
LOG_LEVEL="${LOG_LEVEL:-4}"

dlog() {
    local lvl lvlc

    [ -z "$LOG_LEVEL" ] && return 0
    lvl="${1:?}"; shift
    [ "$lvl" -le "$LOG_LEVEL" ] || return 0
    lvlc="$(_lvl2char "$lvl")" || return 0

    if [ $# -ge 1 ]; then
        echo "$lvlc: $*"
    else
        while read -r line; do
            echo "$lvlc: " "$line"
        done
    fi
}

## @brief Logs message at TRACE level (6)
#
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
dtrace() {
    set +x
    dlog 6 "$@"
    if get_bool "${debug:=}"; then
        set -x
    fi
}

## @brief Logs message at DEBUG level (5)
#
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
ddebug() {
    dlog 5 "$@"
}

## @brief Logs message at INFO level (4)
#
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
dinfo() {
    set +x
    dlog 4 "$@"
    if get_bool "${debug:=}"; then
        set -x
    fi
}

## @brief Logs message at WARN level (3)
#
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
dwarn() {
    set +x
    dlog 3 "$@"
    if get_bool "${debug:=}"; then
        set -x
    fi
}

## @brief Logs message at ERROR level (2)
#
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
derror() {
    dlog 2 "$@"
}

## @brief Logs message at FATAL level (1)
#
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
dfatal() {
    set +x
    dlog 1 "$@"
    if get_bool "${debug:=}"; then
        set -x
    fi
}


# Generic substring function.  If $2 is in $1, return 0.
strstr() { [ "${1#*"$2"*}" != "$1" ]; }

# normalize_path <path>
# Prints the normalized path, where it removes any duplicated
# and trailing slashes.
# Example:
# $ normalize_path ///test/test//
# /test/test
normalize_path() {
    shopt -q -s extglob
    set -- "${1//+(\/)//}"
    shopt -q -u extglob
    echo "${1%/}"
}

# convert_abs_rel <from> <to>
# Prints the relative path, when creating a symlink to <to> from <from>.
# Example:
# $ convert_abs_rel /usr/bin/test /bin/test-2
# ../../bin/test-2
# $ ln -s $(convert_abs_rel /usr/bin/test /bin/test-2) /usr/bin/test
convert_abs_rel() {
    local __current __absolute __abssize __cursize __newpath
    local -i __i __level

    set -- "$(normalize_path "${1:?}")" "$(normalize_path "${2:?}")"

    # corner case #1 - self looping link
    [[ "$1" == "$2" ]] && { echo "${1##*/}"; return; }

    # corner case #2 - own dir link
    [[ "${1%/*}" == "$2" ]] && { echo "."; return; }

    IFS="/" read -ra __current <<< "$1"
    IFS="/" read -ra __absolute <<< "$2"

    __abssize=${#__absolute[@]}
    __cursize=${#__current[@]}

    while [[ "${__absolute[__level]}" == "${__current[__level]}" ]]
    do
        (( __level++ ))
        if (( __level > __abssize || __level > __cursize ))
        then
            break
        fi
    done

    for ((__i = __level; __i < __cursize-1; __i++))
    do
        if ((__i > __level))
        then
            __newpath=$__newpath"/"
        fi
        __newpath=$__newpath".."
    done

    for ((__i = __level; __i < __abssize; __i++))
    do
        if [[ -n $__newpath ]]
        then
            __newpath=$__newpath"/"
        fi
        __newpath=$__newpath${__absolute[__i]}
    done

    echo "$__newpath"
}


# Install a directory, keeping symlinks as on the original system.
# Example: if /lib points to /lib64 on the host, "inst_dir /lib/file"
# will create ${initdir}/lib64, ${initdir}/lib64/file,
# and a symlink ${initdir}/lib -> lib64.
inst_dir() {
    local dir="${1:?}"
    local part="${dir%/*}"
    local file

    [[ -e "${initdir:?}/${dir}" ]] && return 0  # already there

    while [[ "$part" != "${part%/*}" ]] && ! [[ -e "${initdir}/${part}" ]]; do
        dir="$part $dir"
        part="${part%/*}"
    done

    # iterate over parent directories
    for file in $dir; do
        [[ -e "${initdir}/$file" ]] && continue
        if [[ -L $file ]]; then
            inst_symlink "$file"
        else
            # create directory
            mkdir -m 0755 "${initdir}/$file" || return 1
            [[ -e "$file" ]] && chmod --reference="$file" "${initdir}/$file"
            chmod u+w "${initdir}/$file"
        fi
    done
}

# $1 = file to copy to ramdisk
# $2 (optional) Name for the file on the ramdisk
# Location of the image dir is assumed to be $initdir
# We never overwrite the target if it exists.
inst_simple() {
    [[ -f "${1:?}" ]] || return 1
    strstr "$1" "/" || return 1

    local src="$1"
    local target="${2:-$1}"
    if ! [[ -d ${initdir:?}/$target ]]; then
        [[ -e ${initdir}/$target ]] && return 0
        [[ -L ${initdir}/$target ]] && return 0
        [[ -d "${initdir}/${target%/*}" ]] || inst_dir "${target%/*}"
    fi
    # install checksum files also
    if [[ -e "${src%/*}/.${src##*/}.hmac" ]]; then
        inst "${src%/*}/.${src##*/}.hmac" "${target%/*}/.${target##*/}.hmac"
    fi
    ddebug "Installing $src"
    cp --sparse=always -pfL "$src" "${initdir}/$target"
}

# find symlinks linked to given library file
# $1 = library file
# Function searches for symlinks by stripping version numbers appended to
# library filename, checks if it points to the same target and finally
# prints the list of symlinks to stdout.
#
# Example:
# rev_lib_symlinks libfoo.so.8.1
# output: libfoo.so.8 libfoo.so
# (Only if libfoo.so.8 and libfoo.so exists on host system.)
rev_lib_symlinks() {
    local fn="${1:?}"
    local links=""
    local orig
    orig="$(readlink -f "$1")"

    [[ "${fn}" =~ .*\.so\..* ]] || return 1

    until [[ "${fn##*.}" == so ]]; do
        fn="${fn%.*}"
        [[ -L "${fn}" && "$(readlink -f "${fn}")" == "${orig}" ]] && links+=" ${fn}"
    done

    echo "${links}"
}

# Same as above, but specialized to handle dynamic libraries.
# It handles making symlinks according to how the original library
# is referenced.
inst_library() {
    local src="${1:?}"
    local dest="${2:-$1}"
    local reallib symlink

    strstr "$1" "/" || return 1
    [[ -e ${initdir:?}/$dest ]] && return 0
    if [[ -L $src ]]; then
        # install checksum files also
        if [[ -e "${src%/*}/.${src##*/}.hmac" ]]; then
            inst "${src%/*}/.${src##*/}.hmac" "${dest%/*}/.${dest##*/}.hmac"
        fi
        reallib="$(readlink -f "$src")"
        inst_simple "$reallib" "$reallib"
        inst_dir "${dest%/*}"
        [[ -d "${dest%/*}" ]] && dest="$(readlink -f "${dest%/*}")/${dest##*/}"
        ln -sfn -- "$(convert_abs_rel "${dest}" "${reallib}")" "${initdir}/${dest}"
    else
        inst_simple "$src" "$dest"
    fi

    # Create additional symlinks.  See rev_symlinks description.
    for symlink in $(rev_lib_symlinks "$src") ${reallib:+$(rev_lib_symlinks "$reallib")}; do
        if [[ ! -e "$initdir/$symlink" ]]; then
            ddebug "Creating extra symlink: $symlink"
            inst_symlink "$symlink"
        fi
    done
}

# find a binary.  If we were not passed the full path directly,
# search in the usual places to find the binary.
find_binary() {
    local bin="${1:?}"
    if [[ -z ${bin##/*} ]]; then
        if [[ -x "$bin" ]] || { strstr "$bin" ".so" && ldd "$bin" &>/dev/null; }; then
            echo "$bin"
            return 0
        fi
    fi

    type -P "$bin"
}

# Same as above, but specialized to install binary executables.
# Install binary executable, and all shared library dependencies, if any.
inst_binary() {
    local bin="${1:?}"
    local path target

    # In certain cases we might attempt to install a binary which is already
    # present in the test image, yet it's missing from the host system.
    # In such cases, let's check if the binary indeed exists in the image
    # before doing any other checks. If it does, immediately return with
    # success.
    if [[ $# -eq 1 ]]; then
        for path in "" bin sbin usr/bin usr/sbin; do
            [[ -e "${initdir:?}${path:+/$path}/${bin}" ]] && return 0
        done
    fi

    bin="$(find_binary "$bin")" || return 1
    target="${2:-$bin}"
    [[ -e "${initdir:?}/$target" ]] && return 0
    [[ -L "$bin" ]] && inst_symlink "$bin" "$target" && return 0

    local file line
    local so_regex='([^ ]*/lib[^/]*/[^ ]*\.so[^ ]*)'
    # I love bash!
    while read -r line; do
        [[ "$line" = 'not a dynamic executable' ]] && break

        # Ignore errors about our own stuff missing. This is most likely caused
        # by ldd attempting to use the unprefixed RPATH.
        [[ "$line" =~ libsystemd.*\ not\ found ]] && continue

        if [[ "$line" =~ $so_regex ]]; then
            file="${BASH_REMATCH[1]}"
            [[ -e "${initdir}/$file" ]] && continue
            inst_library "$file"
            continue
        fi

        if [[ "$line" =~ not\ found ]]; then
            dfatal "Missing a shared library required by $bin."
            dfatal "Run \"ldd $bin\" to find out what it is."
            dfatal "$line"
            dfatal "Cannot create a test image."
            exit 1
        fi
    done < <(LC_ALL=C ldd "$bin" 2>/dev/null)
    inst_simple "$bin" "$target"
}

# same as above, except for shell scripts.
# If your shell script does not start with shebang, it is not a shell script.
inst_script() {
    local bin line shebang_regex
    bin="$(find_binary "${1:?}")" || return 1
    shift

    read -r -n 80 line <"$bin"
    # If debug is set, clean unprintable chars to prevent messing up the term
    get_bool "${debug:=}" && line="$(echo -n "$line" | tr -c -d '[:print:][:space:]')"
    shebang_regex='(#! *)(/[^ ]+).*'
    [[ "$line" =~ $shebang_regex ]] || return 1
    inst "${BASH_REMATCH[2]}" && inst_simple "$bin" "$@"
}

# same as above, but specialized for symlinks
inst_symlink() {
    local src="${1:?}"
    local target="${2:-$src}"
    local realsrc

    strstr "$src" "/" || return 1
    [[ -L "$src" ]] || return 1
    [[ -L "${initdir:?}/$target" ]] && return 0
    realsrc="$(readlink -f "$src")"
    if ! [[ -e "$initdir/$realsrc" ]]; then
        if [[ -d "$realsrc" ]]; then
            inst_dir "$realsrc"
        else
            inst "$realsrc"
        fi
    fi
    [[ ! -e "$initdir/${target%/*}" ]] && inst_dir "${target%/*}"
    [[ -d "${target%/*}" ]] && target="$(readlink -f "${target%/*}")/${target##*/}"
    ln -sfn -- "$(convert_abs_rel "${target}" "${realsrc}")" "$initdir/$target"
}

# attempt to install any programs specified in a udev rule
inst_rule_programs() {
    local rule="${1:?}"
    local prog bin

    sed -rn 's/^.*?PROGRAM==?"([^ "]+).*$/\1/p' "$rule" | while read -r prog; do
        if [ -x "/lib/udev/$prog" ]; then
            bin="/lib/udev/$prog"
        else
            if ! bin="$(find_binary "$prog")"; then
                dinfo "Skipping program $prog used in udev rule $(basename "$rule") as it cannot be found"
                continue
            fi
        fi

        #dinfo "Installing $_bin due to it's use in the udev rule $(basename $1)"
        image_install "$bin"
    done
}

# udev rules always get installed in the same place, so
# create a function to install them to make life simpler.
inst_rules() {
    local target=/etc/udev/rules.d
    local found rule

    inst_dir "/lib/udev/rules.d"
    inst_dir "$target"
    for rule in "$@"; do
        if [ "${rule#/}" = "$rule" ]; then
            for r in /lib/udev/rules.d /etc/udev/rules.d; do
                if [[ -f "$r/$rule" ]]; then
                    found="$r/$rule"
                    inst_simple "$found"
                    inst_rule_programs "$found"
                fi
            done
        fi
        for r in '' ./; do
            if [[ -f "${r}${rule}" ]]; then
                found="${r}${rule}"
                inst_simple "$found" "$target/${found##*/}"
                inst_rule_programs "$found"
            fi
        done
        [[ $found ]] || dinfo "Skipping udev rule: $rule"
        found=
    done
}

# general purpose installation function
# Same args as above.
inst() {
    case $# in
        1) ;;
        2)
            [[ ! "$initdir" && -d "$2" ]] && export initdir="$2"
            [[ "$initdir" = "$2" ]] && set "$1"
            ;;
        3)
            [[ -z "$initdir" ]] && export initdir="$2"
            set "$1" "$3"
            ;;
        *)
            dfatal "inst only takes 1 or 2 or 3 arguments"
            exit 1
            ;;
    esac

    local fun
    for fun in inst_symlink inst_script inst_binary inst_simple; do
        "$fun" "$@" && return 0
    done

    dwarn "Failed to install '$1'"
    return 1
}

# install any of listed files
#
# If first argument is '-d' and second some destination path, first accessible
# source is installed into this path, otherwise it will installed in the same
# path as source.  If none of listed files was installed, function return 1.
# On first successful installation it returns with 0 status.
#
# Example:
#
# inst_any -d /bin/foo /bin/bar /bin/baz
#
# Lets assume that /bin/baz exists, so it will be installed as /bin/foo in
# initramfs.
inst_any() {
    local dest file

    [[ "${1:?}" = '-d' ]] && dest="${2:?}" && shift 2

    for file in "$@"; do
        if [[ -e "$file" ]]; then
            [[ -n "$dest" ]] && inst "$file" "$dest" && return 0
            inst "$file" && return 0
        fi
    done

    return 1
}

# image_install [-o ] <file> [<file> ... ]
# Install <file> to the test image
# -o optionally install the <file> and don't fail, if it is not there
image_install() {
    local optional=no
    local prog="${1:?}"

    if [[ "$prog" = '-o' ]]; then
        optional=yes
        shift
    fi

    for prog in "$@"; do
        if ! inst "$prog" ; then
            if get_bool "$optional"; then
                dinfo "Skipping program $prog as it cannot be found and is" \
                    "flagged to be optional"
            else
                dfatal "Failed to install $prog"
                exit 1
            fi
        fi
    done
}

# Install a single kernel module along with any firmware it may require.
# $1 = full path to kernel module to install
install_kmod_with_fw() {
    local module="${1:?}"
    # no need to go further if the module is already installed
    [[ -e "${initdir:?}/lib/modules/${KERNEL_VER:?}/${module##*"/lib/modules/$KERNEL_VER/"}" ]] && return 0
    [[ -e "$initdir/.kernelmodseen/${module##*/}" ]] && return 0

    [ -d "$initdir/.kernelmodseen" ] && : >"$initdir/.kernelmodseen/${module##*/}"

    inst_simple "$module" "/lib/modules/$KERNEL_VER/${module##*"/lib/modules/$KERNEL_VER/"}" || return $?

    local modname="${module##*/}"
    local fwdir found fw
    modname="${modname%.ko*}"

    while read -r fw; do
        found=
        for fwdir in /lib/firmware/updates /lib/firmware; do
            if [[ -d "$fwdir" && -f "$fwdir/$fw" ]]; then
                inst_simple "$fwdir/$fw" "/lib/firmware/$fw"
                found=yes
            fi
        done
        if ! get_bool "$found"; then
            if ! grep -qe "\<${modname//-/_}\>" /proc/modules; then
                dinfo "Possible missing firmware \"${fw}\" for kernel module" \
                    "\"${modname}.ko\""
            else
                dwarn "Possible missing firmware \"${fw}\" for kernel module" \
                    "\"${modname}.ko\""
            fi
        fi
    done < <(modinfo -k "$KERNEL_VER" -F firmware "$module" 2>/dev/null)
    return 0
}

# Do something with all the dependencies of a kernel module.
# Note that kernel modules depend on themselves using the technique we use
# $1 = function to call for each dependency we find
#      It will be passed the full path to the found kernel module
# $2 = module to get dependencies for
# rest of args = arguments to modprobe
for_each_kmod_dep() {
    local func="${1:?}"
    local kmod="${2:?}"
    local found=0
    local cmd modpath
    shift 2

    while read -r cmd modpath _; do
        [[ "$cmd" = insmod ]] || continue
        "$func" "$modpath" || return $?
        found=1
    done < <(modprobe "$@" --ignore-install --show-depends "$kmod")

    ! get_bool "$found" && return 1
    return 0
}

# instmods [-c] <kernel module> [<kernel module> ... ]
# instmods [-c] <kernel subsystem>
# install kernel modules along with all their dependencies.
# <kernel subsystem> can be e.g. "=block" or "=drivers/usb/storage"
# FIXME(?): dracutdevs/dracut@f4e38c0da8d6bf3764c1ad753d9d52aef63050e5
instmods() {
    local check=no
    if [[ $# -ge 0 && "$1" = '-c' ]]; then
        check=yes
        shift
    fi

    inst1mod() {
        local mod="${1:?}"
        local ret=0
        local mod_dir="/lib/modules/${KERNEL_VER:?}/"

        case "$mod" in
            =*)
                if [ -f "${mod_dir}/modules.${mod#=}" ]; then
                    (
                        [[ "$mpargs" ]] && echo "$mpargs"
                        cat "${mod_dir}/modules.${mod#=}"
                    ) | instmods
                else
                    (
                        [[ "$mpargs" ]] && echo "$mpargs"
                        find "$mod_dir" -path "*/${mod#=}/*" -name "*.ko*" -type f -printf '%f\n'
                    ) | instmods
                fi
                ;;
            --*)
                mpargs+=" $mod"
                ;;
            i2o_scsi)
                # Do not load this diagnostic-only module
                return
                ;;
            *)
                mod=${mod##*/}
                # if we are already installed, skip this module and go on
                # to the next one.
                [[ -f "${initdir:?}/.kernelmodseen/${mod%.ko}.ko" ]] && return

                # We use '-d' option in modprobe only if modules prefix path
                # differs from default '/'.  This allows us to use Dracut with
                # old version of modprobe which doesn't have '-d' option.
                local mod_dirname=${mod_dir%%/lib/modules/*}
                [[ -n ${mod_dirname} ]] && mod_dirname="-d ${mod_dirname}/"

                # ok, load the module, all its dependencies, and any firmware
                # it may require
                for_each_kmod_dep install_kmod_with_fw "$mod" \
                    --set-version "$KERNEL_VER" \
                    ${mod_dirname:+"$mod_dirname"} \
                    ${mpargs:+"$mpargs"}
                ((ret+=$?))
                ;;
        esac
        return "$ret"
    }

    local mod mpargs

    if [[ $# -eq 0 ]]; then  # filenames from stdin
        while read -r mod; do
            if ! inst1mod "${mod%.ko*}" && [ "$check" = "yes" ]; then
                dfatal "Failed to install $mod"
                return 1
            fi
        done
    fi

    for mod in "$@"; do # filenames as arguments
        if ! inst1mod "${mod%.ko*}" && [ "$check" = "yes" ]; then
            dfatal "Failed to install $mod"
            return 1
        fi
    done

    return 0
}

_umount_dir() {
    local mountpoint="${1:?}"
    if mountpoint -q "$mountpoint"; then
        ddebug "umount $mountpoint"
        umount "$mountpoint"
    fi
}

# can be overridden in specific test
test_setup_cleanup() {
    cleanup_initdir
}

_test_cleanup() {
    # (post-test) cleanup should always ignore failure and cleanup as much as possible
    (
        set +e
        [[ -n "$initdir" ]] && _umount_dir "$initdir"
        [[ -n "$IMAGE_PUBLIC" ]] && rm -vf "$IMAGE_PUBLIC"
        # If multiple setups/cleans are ran in parallel, this can cause a race
        if [[ -n "$IMAGESTATEDIR" && $TEST_PARALLELIZE -ne 1 ]]; then
            rm -vf "${IMAGESTATEDIR}/default.img"
        fi
        [[ -n "$TESTDIR" ]] && rm -vfr "$TESTDIR"
        [[ -n "$STATEFILE" ]] && rm -vf "$STATEFILE"
    ) || :
}

# can be overridden in specific test
test_cleanup() {
    _test_cleanup
}

test_cleanup_again() {
    [ -n "$TESTDIR" ] || return
    rm -rf "$TESTDIR/unprivileged-nspawn-root"
    [[ -n "$initdir" ]] && _umount_dir "$initdir"
}

test_create_image() {
    create_empty_image_rootdir

    # Create what will eventually be our root filesystem onto an overlay
    (
        LOG_LEVEL=5
        setup_basic_environment
    )
}

test_setup() {
    if get_bool "${TEST_REQUIRE_INSTALL_TESTS:?}" && \
            command -v meson >/dev/null && \
            [[ "$(meson configure "${BUILD_DIR:?}" | grep install-tests | awk '{ print $2 }')" != "true" ]]; then
        dfatal "$BUILD_DIR needs to be built with -Dinstall-tests=true"
        exit 1
    fi

    if [ -e "${IMAGE_PRIVATE:?}" ]; then
        echo "Reusing existing image $IMAGE_PRIVATE → $(realpath "$IMAGE_PRIVATE")"
        mount_initdir
    else
        if [ ! -e "${IMAGE_PUBLIC:?}" ]; then
            # default.img is the base that every test uses and optionally appends to
            if [ ! -e "${IMAGESTATEDIR:?}/default.img" ] || [ -n "${TEST_FORCE_NEWIMAGE:=}" ]; then
                # Create the backing public image, but then completely unmount
                # it and drop the loopback device responsible for it, since we're
                # going to symlink/copy the image and mount it again from
                # elsewhere.
                local image_old="${IMAGE_PUBLIC}"
                if [ -z "${TEST_FORCE_NEWIMAGE}" ]; then
                    IMAGE_PUBLIC="${IMAGESTATEDIR}/default.img"
                fi
                test_create_image
                test_setup_cleanup
                umount_loopback
                cleanup_loopdev
                IMAGE_PUBLIC="${image_old}"
            fi
            if [ "${IMAGE_NAME:?}" != "default" ] && ! get_bool "${TEST_FORCE_NEWIMAGE}"; then
                cp -v "$(realpath "${IMAGESTATEDIR}/default.img")" "$IMAGE_PUBLIC"
            fi
        fi

        local hook_defined
        declare -f -F test_append_files >/dev/null && hook_defined=yes || hook_defined=no

        echo "Reusing existing cached image $IMAGE_PUBLIC → $(realpath "$IMAGE_PUBLIC")"
        if get_bool "$TEST_PARALLELIZE" || get_bool "$hook_defined"; then
            cp -v -- "$(realpath "$IMAGE_PUBLIC")" "$IMAGE_PRIVATE"
        else
            ln -sv -- "$(realpath "$IMAGE_PUBLIC")" "$IMAGE_PRIVATE"
        fi

        mount_initdir
        # We want to test all services in TEST-01-BASIC, but mask them in
        # all other tests
        if [[ "${TESTID:?}" != "01" ]]; then
            dinfo "Masking supporting services"
            mask_supporting_services
        fi

        if get_bool "$hook_defined"; then
            test_append_files "${initdir:?}"
        fi
    fi

    setup_nspawn_root
}

test_run() {
    local test_id="${1:?}"
    mount_initdir

    if ! get_bool "${TEST_NO_QEMU:=}"; then
        if run_qemu "$test_id"; then
            check_result_qemu || { echo "qemu test failed"; return 1; }
        else
            dwarn "can't run qemu, skipping"
        fi
    fi
    if ! get_bool "${TEST_NO_NSPAWN:=}"; then
        mount_initdir
        if run_nspawn "${initdir:?}" "$test_id"; then
            check_result_nspawn "$initdir" || { echo "nspawn-root test failed"; return 1; }
        else
            dwarn "can't run systemd-nspawn, skipping"
        fi

        if get_bool "${RUN_IN_UNPRIVILEGED_CONTAINER:=}"; then
            dir="$TESTDIR/unprivileged-nspawn-root"
            if NSPAWN_ARGUMENTS="-U --private-network ${NSPAWN_ARGUMENTS:-}" run_nspawn "$dir" "$test_id"; then
                check_result_nspawn "$dir" || { echo "unprivileged-nspawn-root test failed"; return 1; }
            else
                dwarn "can't run systemd-nspawn, skipping"
            fi
        fi
    fi
    return 0
}

do_test() {
    if [[ $UID != "0" ]]; then
        echo "TEST: $TEST_DESCRIPTION [SKIPPED]: not root" >&2
        exit 0
    fi

    if get_bool "${TEST_NO_QEMU:=}" && get_bool "${TEST_NO_NSPAWN:=}"; then
        echo "TEST: $TEST_DESCRIPTION [SKIPPED]: both qemu and nspawn disabled" >&2
        exit 0
    fi

    if get_bool "${TEST_QEMU_ONLY:=}" && ! get_bool "$TEST_NO_NSPAWN"; then
        echo "TEST: $TEST_DESCRIPTION [SKIPPED]: qemu-only tests requested" >&2
        exit 0
    fi

    if get_bool "${TEST_PREFER_NSPAWN:=}" && ! get_bool "$TEST_NO_NSPAWN"; then
        TEST_NO_QEMU=1
    fi

    # Detect lib paths
    [[ "$libdir" ]] || for libdir in /lib64 /lib; do
        [[ -d $libdir ]] && libdirs+=" $libdir" && break
    done

    [[ "$usrlibdir" ]] || for usrlibdir in /usr/lib64 /usr/lib; do
        [[ -d $usrlibdir ]] && libdirs+=" $usrlibdir" && break
    done

    mkdir -p "$STATEDIR"

    import_testdir
    import_initdir

    if [ -n "${SUDO_USER}" ]; then
        ddebug "Making ${TESTDIR:?} readable for ${SUDO_USER} (acquired from sudo)"
        setfacl -m "user:${SUDO_USER:?}:r-X" "${TESTDIR:?}"
    fi

    testname="$(basename "$PWD")"

    while (($# > 0)); do
        case $1 in
            --run)
                echo "${testname} RUN: $TEST_DESCRIPTION"
                test_run "$TESTID"
                ret=$?
                if [ $ret -eq 0 ]; then
                    echo "${testname} RUN: $TEST_DESCRIPTION [OK]"
                else
                    echo "${testname} RUN: $TEST_DESCRIPTION [FAILED]"
                fi
                exit $ret
                ;;
            --setup)
                echo "${testname} SETUP: $TEST_DESCRIPTION"
                test_setup
                test_setup_cleanup
                ;;
            --clean)
                echo "${testname} CLEANUP: $TEST_DESCRIPTION"
                test_cleanup
                ;;
            --clean-again)
                echo "${testname} CLEANUP AGAIN: $TEST_DESCRIPTION"
                test_cleanup_again
                ;;
            --all)
                ret=0
                echo -n "${testname}: $TEST_DESCRIPTION "
                # Do not use a subshell, otherwise cleanup variables (LOOPDEV) will be lost
                # and loop devices will leak
                test_setup </dev/null >"$TESTLOG" 2>&1 || ret=$?
                if [ $ret -eq 0 ]; then
                    test_setup_cleanup </dev/null >>"$TESTLOG" 2>&1 || ret=$?
                fi
                if [ $ret -eq 0 ]; then
                    test_run "$TESTID" </dev/null >>"$TESTLOG" 2>&1 || ret=$?
                fi
                test_cleanup
                if [ $ret -eq 0 ]; then
                    rm "$TESTLOG"
                    echo "[OK]"
                else
                    echo "[FAILED]"
                    echo "see $TESTLOG"
                fi
                exit $ret
                ;;
            *)
                break
                ;;
        esac
        shift
    done
}
